What is reactjs.org?

This repository holds the source code and all the documentation for reactjs.org, the official website where people learn about React, a popular JavaScript library for building user interfaces. Think of it as the instruction manual and how-to guide for anyone trying to understand what React is and how to use it. The site is built using Gatsby, a tool that turns content (mostly written as text files and React components) into a fast, static website. The documentation is stored as markdown files, plain text with simple formatting, alongside interactive examples built with React itself. When someone visits reactjs.org, they're seeing the compiled version of everything in this repository. The site supports hot-reloading, which means developers working on it can edit content or code and immediately see changes in their browser without manually refreshing. People who would contribute to this repository are typically React team members, community volunteers, and documentation maintainers who want to improve the guides, tutorials, API references, or fix typos and broken examples on the site. For example, if someone discovers that a code sample in the documentation doesn't work in the latest version of React, they'd fork this repo, make the fix locally, and submit it back to the team for review. The process is streamlined with automated checks (using tools like Prettier and ESLint to catch formatting and code quality issues) and automatic preview builds so reviewers can see exactly what the changes look like before they go live. The README makes it straightforward for contributors: clone the repo, install dependencies with Yarn, run a local development server, make changes, test across browsers, and submit a pull request. It's designed to lower the barrier to entry so that people who aren't React core team members can still help keep the documentation accurate and helpful.