diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index 7363a5f6..a756fd00 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -16,7 +16,7 @@ Want to contribute? Great. Please review the following guidelines carefully and
 
 ## Reporting bugs
 
-1. Update to the most recent master release; the bug may already be fixed.
+1. Update to the most recent main release; the bug may already be fixed.
 2. Search for existing issues; it's possible someone has already encountered this bug.
 3. Try to isolate the problem and include steps to reproduce it.
 4. Share as much information as possible (e.g. browser/OS environment, log output, stack trace, screenshots, etc.).
@@ -44,7 +44,7 @@ Use the [Trello board](https://trello.com/b/6BmTulfx/devdocs-documentation) wher
 
 ## Contributing new documentations
 
-See the [`docs` folder](https://github.com/freeCodeCamp/devdocs/tree/master/docs) to learn how to add new documentations.
+See the [`docs` folder](https://github.com/freeCodeCamp/devdocs/tree/main/docs) to learn how to add new documentations.
 
 **Important:** the documentation's license must permit alteration, redistribution and commercial use, and the documented software must be released under an open source license. Feel free to get in touch if you're not sure if a documentation meets those requirements.
 
diff --git a/.github/ISSUE_TEMPLATE/feature_request.md b/.github/ISSUE_TEMPLATE/feature_request.md
index 593d59aa..a496a10d 100644
--- a/.github/ISSUE_TEMPLATE/feature_request.md
+++ b/.github/ISSUE_TEMPLATE/feature_request.md
@@ -19,7 +19,7 @@ Verify this steps before suggeting a new feature:
     https://github.com/freeCodeCamp/devdocs/labels/feature
 
   - Make sure your feature fits DevDocs' vision
-    https://github.com/freeCodeCamp/devdocs/blob/master/README.md#vision
+    https://github.com/freeCodeCamp/devdocs/blob/main/README.md#vision
 -->
 
 ## Summary
diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
index 5dc7eda4..f8bc6637 100644
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -4,7 +4,7 @@
 <!-- Please create a draft PR when you haven't completed all steps yet upon creation of the PR. -->
 
 <!-- SECTION A - Adding a new scraper -->
-<!-- See https://github.com/freeCodeCamp/devdocs/blob/master/.github/CONTRIBUTING.md#contributing-new-documentations -->
+<!-- See https://github.com/freeCodeCamp/devdocs/blob/main/.github/CONTRIBUTING.md#contributing-new-documentations -->
 
 If you’re adding a new scraper, please ensure that you have:
 
@@ -17,7 +17,7 @@ If you’re adding a new scraper, please ensure that you have:
   - [ ] `SOURCE`: A text file containing the URL to the page the image can be found on or the URL of the original image itself
 
 <!-- SECTION B - Updating an existing documentation to it's latest version -->
-<!-- See https://github.com/freeCodeCamp/devdocs/blob/master/.github/CONTRIBUTING.md#updating-existing-documentations -->
+<!-- See https://github.com/freeCodeCamp/devdocs/blob/main/.github/CONTRIBUTING.md#updating-existing-documentations -->
 
 If you're updating an existing documentation to it's latest version, please ensure that you have:
 
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 1de9ec36..e9248ebe 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -3,7 +3,7 @@ name: Deploy
 on:
   push:
     branches:
-      - master
+      - main
 
 jobs:
   test:
diff --git a/README.md b/README.md
index b30d3789..35367313 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,7 @@ Finally, point your browser at [localhost:9292](http://localhost:9292) (the firs
 
 The `thor docs:download` command is used to download pre-generated documentations from DevDocs's servers (e.g. `thor docs:download html css`). You can see the list of available documentations and versions by running `thor docs:list`. To update all downloaded documentations, run `thor docs:download --installed`. To download and install all documentation this project has available, run `thor docs:download --all`.
 
-**Note:** there is currently no update mechanism other than `git pull origin master` to update the code and `thor docs:download --installed` to download the latest version of the docs. To stay informed about new releases, be sure to [watch](https://github.com/freeCodeCamp/devdocs/subscription) this repository.
+**Note:** there is currently no update mechanism other than `git pull origin main` to update the code and `thor docs:download --installed` to download the latest version of the docs. To stay informed about new releases, be sure to [watch](https://github.com/freeCodeCamp/devdocs/subscription) this repository.
 
 Alternatively, DevDocs may be started as a Docker container:
 
diff --git a/assets/javascripts/templates/pages/about_tmpl.coffee b/assets/javascripts/templates/pages/about_tmpl.coffee
index 07956a50..93972075 100644
--- a/assets/javascripts/templates/pages/about_tmpl.coffee
+++ b/assets/javascripts/templates/pages/about_tmpl.coffee
@@ -25,8 +25,8 @@ app.templates.aboutPage = -> """
     <strong>Copyright 2013&ndash;2021 Thibaut Courouble and <a href="https://github.com/freeCodeCamp/devdocs/graphs/contributors">other contributors</a></strong><br>
     This software is licensed under the terms of the Mozilla Public License v2.0.<br>
     You may obtain a copy of the source code at <a href="https://github.com/freeCodeCamp/devdocs">github.com/freeCodeCamp/devdocs</a>.<br>
-    For more information, see the <a href="https://github.com/freeCodeCamp/devdocs/blob/master/COPYRIGHT">COPYRIGHT</a>
-    and <a href="https://github.com/freeCodeCamp/devdocs/blob/master/LICENSE">LICENSE</a> files.
+    For more information, see the <a href="https://github.com/freeCodeCamp/devdocs/blob/main/COPYRIGHT">COPYRIGHT</a>
+    and <a href="https://github.com/freeCodeCamp/devdocs/blob/main/LICENSE">LICENSE</a> files.
 
   <h2 class="_block-heading" id="plugins">Plugins and Extensions</h2>
   <ul>
diff --git a/assets/javascripts/templates/pages/root_tmpl.coffee.erb b/assets/javascripts/templates/pages/root_tmpl.coffee.erb
index e4a7e593..77deab0e 100644
--- a/assets/javascripts/templates/pages/root_tmpl.coffee.erb
+++ b/assets/javascripts/templates/pages/root_tmpl.coffee.erb
@@ -15,10 +15,10 @@ app.templates.intro = """
       <li>To be notified about new versions, don't forget to <a href="https://github.com/freeCodeCamp/devdocs/subscription">watch the repository</a> on GitHub.
       <li>The <a href="https://github.com/freeCodeCamp/devdocs/issues">issue tracker</a> is the preferred channel for bug reports and
           feature requests. For everything else, use <a href="https://gitter.im/FreeCodeCamp/DevDocs">Gitter</a>.
-      <li>Contributions are welcome. See the <a href="https://github.com/freeCodeCamp/devdocs/blob/master/CONTRIBUTING.md">guidelines</a>.
+      <li>Contributions are welcome. See the <a href="https://github.com/freeCodeCamp/devdocs/blob/main/CONTRIBUTING.md">guidelines</a>.
       <li>DevDocs is licensed under the terms of the Mozilla Public License v2.0. For more information,
-          see the <a href="https://github.com/freeCodeCamp/devdocs/blob/master/COPYRIGHT">COPYRIGHT</a> and
-          <a href="https://github.com/freeCodeCamp/devdocs/blob/master/LICENSE">LICENSE</a> files.
+          see the <a href="https://github.com/freeCodeCamp/devdocs/blob/main/COPYRIGHT">COPYRIGHT</a> and
+          <a href="https://github.com/freeCodeCamp/devdocs/blob/main/LICENSE">LICENSE</a> files.
     </ol>
     <p>Happy coding!
   </div></div>
diff --git a/docs/filter-reference.md b/docs/filter-reference.md
index 6c138771..fcd552d2 100644
--- a/docs/filter-reference.md
+++ b/docs/filter-reference.md
@@ -11,7 +11,7 @@
 
 Filters use the [HTML::Pipeline](https://github.com/jch/html-pipeline) library. They take an HTML string or [Nokogiri](http://nokogiri.org/) node as input, optionally perform modifications and/or extract information from it, and then outputs the result. Together they form a pipeline where each filter hands its output to the next filter's input. Every documentation page passes through this pipeline before being copied on the local filesystem.
 
-Filters are subclasses of the [`Docs::Filter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/core/filter.rb) class and require a `call` method. A basic implementation looks like this:
+Filters are subclasses of the [`Docs::Filter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/core/filter.rb) class and require a `call` method. A basic implementation looks like this:
 
 ```ruby
 module Docs
@@ -46,7 +46,7 @@ The `call` method must return either `doc` or `html`, depending on the type of f
   - `:path` — the page's normalized path
   - `:store_path` — the path where the page will be stored (equal to `:path` with `.html` at the end)
   - `:internal_urls` — the list of distinct internal URLs found within the page
-  - `:entries` — the [`Entry`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/core/models/entry.rb) objects to add to the index
+  - `:entries` — the [`Entry`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/core/models/entry.rb) objects to add to the index
 
 * `css`, `at_css`, `xpath`, `at_xpath`
   Shortcuts for `doc.css`, `doc.xpath`, etc.
@@ -73,23 +73,23 @@ The `call` method must return either `doc` or `html`, depending on the type of f
 
 ## Core filters
 
-* [`ContainerFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/container.rb) — changes the root node of the document (remove everything outside)
-* [`CleanHtmlFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/clean_html.rb) — removes HTML comments, `<script>`, `<style>`, etc.
-* [`NormalizeUrlsFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/normalize_urls.rb) — replaces all URLs with their fully qualified counterpart
-* [`InternalUrlsFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/internal_urls.rb) — detects internal URLs (the ones to scrape) and replaces them with their unqualified, relative counterpart
-* [`NormalizePathsFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/normalize_paths.rb) — makes the internal paths consistent (e.g. always end with `.html`)
-* [`CleanLocalUrlsFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/clean_local_urls.rb) — removes links, iframes and images pointing to localhost (`FileScraper` only)
-* [`InnerHtmlFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/inner_html.rb) — converts the document to a string
-* [`CleanTextFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/clean_text.rb) — removes empty nodes
-* [`AttributionFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/attribution.rb) — appends the license info and link to the original document
-* [`TitleFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/title.rb) — prepends the document with a title (disabled by default)
-* [`EntriesFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/entries.rb) — abstract filter for extracting the page's metadata
+* [`ContainerFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/container.rb) — changes the root node of the document (remove everything outside)
+* [`CleanHtmlFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/clean_html.rb) — removes HTML comments, `<script>`, `<style>`, etc.
+* [`NormalizeUrlsFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/normalize_urls.rb) — replaces all URLs with their fully qualified counterpart
+* [`InternalUrlsFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/internal_urls.rb) — detects internal URLs (the ones to scrape) and replaces them with their unqualified, relative counterpart
+* [`NormalizePathsFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/normalize_paths.rb) — makes the internal paths consistent (e.g. always end with `.html`)
+* [`CleanLocalUrlsFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/clean_local_urls.rb) — removes links, iframes and images pointing to localhost (`FileScraper` only)
+* [`InnerHtmlFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/inner_html.rb) — converts the document to a string
+* [`CleanTextFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/clean_text.rb) — removes empty nodes
+* [`AttributionFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/attribution.rb) — appends the license info and link to the original document
+* [`TitleFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/title.rb) — prepends the document with a title (disabled by default)
+* [`EntriesFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/entries.rb) — abstract filter for extracting the page's metadata
 
 ## Custom filters
 
 Scrapers can have any number of custom filters but require at least the two described below.
 
-**Note:** filters are located in the [`lib/docs/filters`](https://github.com/freeCodeCamp/devdocs/tree/master/lib/docs/filters/) directory. The class's name must be the [CamelCase](http://api.rubyonrails.org/classes/String.html#method-i-camelize) equivalent of the filename.
+**Note:** filters are located in the [`lib/docs/filters`](https://github.com/freeCodeCamp/devdocs/tree/main/lib/docs/filters/) directory. The class's name must be the [CamelCase](http://api.rubyonrails.org/classes/String.html#method-i-camelize) equivalent of the filename.
 
 ### `CleanHtmlFilter`
 
@@ -141,10 +141,10 @@ The `Entries` filter is responsible for extracting the page's metadata, represen
 
 The following two models are used under the hood to represent the metadata:
 
-* [`Entry(name, type, path)`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/core/models/entry.rb)
-* [`Type(name, slug, count)`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/core/models/type.rb)
+* [`Entry(name, type, path)`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/core/models/entry.rb)
+* [`Type(name, slug, count)`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/core/models/type.rb)
 
-Each scraper must implement its own `EntriesFilter` by subclassing the [`Docs::EntriesFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/entries.rb) class. The base class already implements the `call` method and includes four methods which the subclasses can override:
+Each scraper must implement its own `EntriesFilter` by subclassing the [`Docs::EntriesFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/entries.rb) class. The base class already implements the `call` method and includes four methods which the subclasses can override:
 
 * `get_name` [String]
   The name of the default entry (aka. the page's name).
diff --git a/docs/maintainers.md b/docs/maintainers.md
index 2641a1ed..1014be79 100644
--- a/docs/maintainers.md
+++ b/docs/maintainers.md
@@ -78,7 +78,7 @@ In addition to the [publicly-documented commands](https://github.com/freeCodeCam
 
 ## Deploying DevDocs
 
-Once docs have been uploaded via `thor docs:upload` (if applicable), you can push to the DevDocs master branch (or merge the PR containing the updates). If the Travis build succeeds, the Heroku application will be deployed automatically.
+Once docs have been uploaded via `thor docs:upload` (if applicable), you can push to the DevDocs main branch (or merge the PR containing the updates). If the Travis build succeeds, the Heroku application will be deployed automatically.
 
 - If you're deploying documentation updates, verify that the documentations work properly once the deploy is done. Keep in mind that you'll need to wait a few seconds for the service worker to finish caching the new assets. You should see a "DevDocs has been updated" notification appear when the caching is done, after which you need to refresh the page to see the changes.
 - If you're deploying frontend changes, monitor [Sentry](https://sentry.io/devdocs/devdocs-js/) for new JS errors once the deploy is done.
diff --git a/docs/scraper-reference.md b/docs/scraper-reference.md
index fc00876d..35c49dfa 100644
--- a/docs/scraper-reference.md
+++ b/docs/scraper-reference.md
@@ -16,7 +16,7 @@ Scrapers rely on the following libraries:
 * [HTML::Pipeline](https://github.com/jch/html-pipeline) for applying filters
 * [Nokogiri](http://nokogiri.org/) for parsing HTML
 
-There are currently two kinds of scrapers: [`UrlScraper`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/core/scrapers/url_scraper.rb) which downloads files via HTTP and [`FileScraper`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/core/scrapers/file_scraper.rb) which reads them from the local filesystem. They function almost identically (both use URLs), except that `FileScraper` substitutes the base URL with a local path before reading a file. `FileScraper` uses the placeholder `localhost` base URL by default and includes a filter to remove any URL pointing to it at the end.
+There are currently two kinds of scrapers: [`UrlScraper`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/core/scrapers/url_scraper.rb) which downloads files via HTTP and [`FileScraper`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/core/scrapers/file_scraper.rb) which reads them from the local filesystem. They function almost identically (both use URLs), except that `FileScraper` substitutes the base URL with a local path before reading a file. `FileScraper` uses the placeholder `localhost` base URL by default and includes a filter to remove any URL pointing to it at the end.
 
 To be processed, a response must meet the following requirements:
 
@@ -36,7 +36,7 @@ Configuration is done via class attributes and divided into three main categorie
 * [Filter stacks](#filter-stacks) — the list of filters that will be applied to each page.
 * [Filter options](#filter-options) — the options passed to said filters.
 
-**Note:** scrapers are located in the [`lib/docs/scrapers`](https://github.com/freeCodeCamp/devdocs/tree/master/lib/docs/scrapers/) directory. The class's name must be the [CamelCase](http://api.rubyonrails.org/classes/String.html#method-i-camelize) equivalent of the filename.
+**Note:** scrapers are located in the [`lib/docs/scrapers`](https://github.com/freeCodeCamp/devdocs/tree/main/lib/docs/scrapers/) directory. The class's name must be the [CamelCase](http://api.rubyonrails.org/classes/String.html#method-i-camelize) equivalent of the filename.
 
 ### Attributes
 
@@ -76,12 +76,12 @@ Configuration is done via class attributes and divided into three main categorie
   Defaults to `{}`.
 
 * `abstract` [Boolean]
-  Make the scraper abstract / not runnable. Used for sharing behavior with other scraper classes (e.g. all MDN scrapers inherit from the abstract [`Mdn`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/scrapers/mdn/mdn.rb) class).
+  Make the scraper abstract / not runnable. Used for sharing behavior with other scraper classes (e.g. all MDN scrapers inherit from the abstract [`Mdn`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/scrapers/mdn/mdn.rb) class).
   Defaults to `false`.
 
 ### Filter stacks
 
-Each scraper has two [filter](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/core/filter.rb) [stacks](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/core/filter_stack.rb): `html_filters` and `text_filters`. They are combined into a pipeline (using the [HTML::Pipeline](https://github.com/jch/html-pipeline) library) which causes each filter to hand its output to the next filter's input.
+Each scraper has two [filter](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/core/filter.rb) [stacks](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/core/filter_stack.rb): `html_filters` and `text_filters`. They are combined into a pipeline (using the [HTML::Pipeline](https://github.com/jch/html-pipeline) library) which causes each filter to hand its output to the next filter's input.
 
 HTML filters are executed first and manipulate a parsed version of the document (a [Nokogiri](http://nokogiri.org/Nokogiri/XML/Node.html) node object), whereas text filters manipulate the document as a string. This separation avoids parsing the document multiple times.
 
@@ -98,23 +98,23 @@ replace(index, name)         # replace one filter with another (index can be a n
 
 Default `html_filters`:
 
-* [`ContainerFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/container.rb) — changes the root node of the document (remove everything outside)
-* [`CleanHtmlFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/clean_html.rb) — removes HTML comments, `<script>`, `<style>`, etc.
-* [`NormalizeUrlsFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/normalize_urls.rb) — replaces all URLs with their fully qualified counterpart
-* [`InternalUrlsFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/internal_urls.rb) — detects internal URLs (the ones to scrape) and replaces them with their unqualified, relative counterpart
-* [`NormalizePathsFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/normalize_paths.rb) — makes the internal paths consistent (e.g. always end with `.html`)
-* [`CleanLocalUrlsFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/clean_local_urls.rb) — removes links, iframes and images pointing to localhost (`FileScraper` only)
+* [`ContainerFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/container.rb) — changes the root node of the document (remove everything outside)
+* [`CleanHtmlFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/clean_html.rb) — removes HTML comments, `<script>`, `<style>`, etc.
+* [`NormalizeUrlsFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/normalize_urls.rb) — replaces all URLs with their fully qualified counterpart
+* [`InternalUrlsFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/internal_urls.rb) — detects internal URLs (the ones to scrape) and replaces them with their unqualified, relative counterpart
+* [`NormalizePathsFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/normalize_paths.rb) — makes the internal paths consistent (e.g. always end with `.html`)
+* [`CleanLocalUrlsFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/clean_local_urls.rb) — removes links, iframes and images pointing to localhost (`FileScraper` only)
 
 Default `text_filters`:
 
-* [`InnerHtmlFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/inner_html.rb) — converts the document to a string
-* [`CleanTextFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/clean_text.rb) — removes empty nodes
-* [`AttributionFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/attribution.rb) — appends the license info and link to the original document
+* [`InnerHtmlFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/inner_html.rb) — converts the document to a string
+* [`CleanTextFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/clean_text.rb) — removes empty nodes
+* [`AttributionFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/attribution.rb) — appends the license info and link to the original document
 
 Additionally:
 
-* [`TitleFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/title.rb) is a core HTML filter, disabled by default, which prepends the document with a title (`<h1>`).
-* [`EntriesFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/entries.rb) is an abstract HTML filter that each scraper must implement and responsible for extracting the page's metadata.
+* [`TitleFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/title.rb) is a core HTML filter, disabled by default, which prepends the document with a title (`<h1>`).
+* [`EntriesFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/entries.rb) is an abstract HTML filter that each scraper must implement and responsible for extracting the page's metadata.
 
 ### Filter options
 
@@ -122,7 +122,7 @@ The filter options are stored in the `options` Hash. The Hash is inheritable (a
 
 More information about how filters work is available on the [Filter Reference](./filter-reference.md) page.
 
-* [`ContainerFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/container.rb)
+* [`ContainerFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/container.rb)
 
   - `:container` [String or Proc]
     A CSS selector of the container element. Everything outside of it will be removed and become unavailable to the other filters. If more than one element match the selector, the first one inside the DOM is used. If no elements match the selector, an error is raised.
@@ -130,7 +130,7 @@ More information about how filters work is available on the [Filter Reference](.
     The default container is the `<body>` element.
     _Note: links outside of the container element will not be followed by the scraper. To remove links that should be followed, use a [`CleanHtml`](./filter-reference.md#cleanhtmlfilter) filter later in the stack._
 
-* [`NormalizeUrlsFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/normalize_urls.rb)
+* [`NormalizeUrlsFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/normalize_urls.rb)
   The following options are used to modify URLs in the pages. They are useful to remove duplicates (when the same page is accessible from multiple URLs) and fix websites that have a bunch of redirections in place (when URLs that should be scraped, aren't, because they are behind a redirection which is outside of the `base_url` — see the MDN scrapers for examples of this).
 
   - `:replace_urls` [Hash]
@@ -144,7 +144,7 @@ More information about how filters work is available on the [Filter Reference](.
 
   _Note: before these rules are applied, all URLs are converted to their fully qualified counterpart (http://...)._
 
-* [`InternalUrlsFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/internal_urls.rb)
+* [`InternalUrlsFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/internal_urls.rb)
 
   Internal URLs are the ones _inside_ the scraper's `base_url` ("inside" more or less means "starting with", except that `/docs` is outside `/doc`). They will be scraped unless excluded by one of the following rules. All internal URLs are converted to relative URLs inside the pages.
 
@@ -170,12 +170,12 @@ More information about how filters work is available on the [Filter Reference](.
 
   _Note: pages can be excluded from the index based on their content using the [`Entries`](./filter-reference.md#entriesfilter) filter. However, their URLs will still be converted to relative in the other pages and trying to open them will return a 404 error. Although not ideal, this is often better than having to maintain a long list of `:skip` URLs._
 
-* [`AttributionFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/attribution.rb)
+* [`AttributionFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/attribution.rb)
 
   - `:attribution` [String] **(required)**
     An HTML string with the copyright and license information. See the other scrapers for examples.
 
-* [`TitleFilter`](https://github.com/freeCodeCamp/devdocs/blob/master/lib/docs/filters/core/title.rb)
+* [`TitleFilter`](https://github.com/freeCodeCamp/devdocs/blob/main/lib/docs/filters/core/title.rb)
 
   - `:title` [String or Boolean or Proc]
     Unless the value is `false`, adds a title to every page.