GitHub Explore: How the Community-Curated Topics and Collections Repository Works

What the github/explore Repository Contains and Who Uses It

GitHub's Topics and Collections pages at github.com/topics and github.com/collections present curated entry points into the GitHub ecosystem. The github/explore repository is the source of truth for the text, images, and metadata on those pages. When you see a description for the 'machine-learning' topic or a curated list of repositories in a themed collection, that content comes from this repository.

Topics, as the repository's README describes, help users explore repositories in a particular subject area, learn more about that subject, and find projects to contribute to. Collections extend that further by grouping hand-picked repositories, developers, organizations, videos, and articles that share a common theme. The repository does not contain any application code that renders these pages. It holds only the content that feeds them.

The audience for contributing is anyone in the developer community who notices a topic description that is out of date, a collection that is missing an important project, or a subject area that has no topic page at all. GitHub staff manage the repository but accept community pull requests, which makes this one of the few places where a community member can directly improve what other developers see when they browse GitHub by technology.

Topics Versus Collections: Two Distinct Content Types

The repository maintains two separate content types with different purposes and formats, stored in separate directories.

Topics live in the `topics/` directory and map one-to-one to technology or subject areas. Each topic has its own directory containing a description, a representative image, and optional related topics. The format defines what the topic page displays when a user clicks on a topic tag attached to a repository.

Collections live in the `collections/` directory and are thematic groupings that cross topic boundaries. A collection for 'tools for open-source maintainers' might include repositories that span multiple topics such as documentation, testing, and CI. Collections can also include links to developers, organizations, videos, and articles, not just repositories. This makes them richer editorial pieces than topic pages.

The `_topics/` and `_explore_collections/` directories at the top level hold the configuration files and templates that define the expected structure for each type. Contributors must match that structure exactly, because the automated tests check format compliance rather than content quality.

Repository Layout and Where to Find the Files

The top-level structure is organized clearly. The `topics/` directory holds one subdirectory per topic, each containing the content files for that topic page. The `collections/` directory holds one subdirectory per collection. The `docs/` directory contains guidance documents for contributors beyond what CONTRIBUTING.md covers.

The `test/` directory holds the RuboCop configuration and test scripts. The `.rubocop.yml` at the root defines the lint rules that every topic and collection file must pass. The `Gemfile` and `Gemfile.lock` specify the Ruby and Bundler dependencies needed to run those tests locally.

The `feed.json.liquid` file generates a feed of topics. The `_config.yml` and `index.md` handle the repository's own GitHub Pages setup. The `CODEOWNERS` file designates which team within GitHub is responsible for reviewing pull requests, which determines how long contributors may wait for a review.

Running the Lint Tests Before Opening a Pull Request

GitHub Actions runs the lint tests automatically on every pull request, but the README recommends running them locally first to catch format problems before the PR is visible to reviewers. You need Ruby and Bundler installed.

To install the test dependencies:

bundle install

To run the linter:

bundle exec rubocop

RuboCop checks format and structure, not prose quality. It will flag things like incorrect YAML indentation, missing required fields, or file naming that does not match the convention. A PR that fails the RuboCop check will not proceed to human review until those failures are resolved. Running `bundle exec rubocop` locally and fixing every reported issue before pushing saves the round-trip of waiting for CI to report the same errors.

What This Repository Does Not Cover

The github/explore repository controls content only. It does not govern how GitHub ranks topics in search results, how repositories are assigned to topics algorithmically, or what appears on the trending page. Those are platform-level decisions made by GitHub's engineering team and are not configurable through this repository.

The repository also does not hold the rendering templates or the JavaScript that powers the browsing interface. If a topic page displays incorrectly in the browser, or if the layout of a collection looks broken, that is a bug in GitHub's platform, not in this repository. Issues about rendering behavior should be filed through GitHub's standard support channels, not as issues on this repository.

Content additions are subject to acceptance by the CODEOWNERS team. A well-formatted PR for a topic that GitHub's team considers too niche or too commercial may not be merged. The CONTRIBUTING.md policy document sets the criteria, but there is a degree of editorial discretion that falls to GitHub staff.

github/explore Compared to Awesome Lists

The 'awesome-*' family of repositories on GitHub serves a related but different purpose. An awesome list is a markdown file maintained by one or more community contributors that curates links to tools, libraries, and resources in a specific area. Anyone can create an awesome list, and there is no central editorial control or GitHub platform integration.

The github/explore repository, by contrast, feeds directly into GitHub's official browsing interface. Content that lands in this repository appears on github.com/topics and github.com/collections for all GitHub users. That reach is larger than any individual awesome list, but the editorial barrier is also higher: the format is strict, the tests are automated, and GitHub staff make the final call on what is accepted.

The practical difference for a contributor is that an awesome list is faster to add to (open a PR on that list's repository with no format tests) while a topics contribution requires passing RuboCop and waiting for GitHub staff review. Both serve discovery, but awesome lists are decentralized and github/explore is centrally controlled.

License and Attribution Requirements

All content in this repository is released under the Creative Commons Attribution 4.0 International License (CC-BY-4.0). This license permits reuse, modification, and redistribution of the content for almost any purpose, including commercial use, as long as attribution is given. It does not grant trademark rights.

The `notices.md` file at the root contains the complete attribution guidelines and lists the software and third-party licenses that apply to the test toolchain. Anyone reusing topic descriptions or collection metadata from this repository must include the attribution statement described there.

The CC-BY-4.0 license applies to the content files in `topics/` and `collections/`. The Ruby tooling under `test/` and the Bundler configuration are governed by their own upstream licenses. Contributors retain no special rights over the content they add once it is merged: the CC-BY-4.0 grant is irrevocable, and the content becomes part of the repository under that license.

Editorial conclusion

The github/explore repository is the right place to contribute when a technology topic is missing from GitHub's browsing pages or when an existing collection description needs a correction. It is not the right place to file requests for changes to how GitHub renders the pages or handles discovery ranking. Before contributing, read CONTRIBUTING.md carefully: the automated RuboCop checks will reject PRs that do not match the expected format, and understanding the format constraints before writing saves revision cycles. Content is released under CC-BY-4.0, so it can be reused with attribution but not under trademark.

Frequently asked questions

Official sources

1. github/explore on GitHub
2. Issues
3. License: CC-BY-4.0
4. Project website
5. README