React.dev (opens in new tab)

Although that submission was a few minutes later than this one, the post contains more information, so I guess we'll keep that one. Sorry Knajjars! (In the future we'll have a karma sharing system that isn't winner-take-all for stories like this.)

tl;dr

• 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.