• The new React site (react.dev) teaches modern React with function components and Hooks. • We’ve included diagrams, illustrations, challenges, and over 600 new interactive examples. • The previous React documentation site has now moved to legacy.reactjs.org.

React is the library for web and native user interfaces. Build user interfaces out of individual pieces called components written in JavaScript. React is designed to let you seamlessly combine components written by independent people, teams, and organizations.