These docs are old and won’t be updated. Go to react.dev for the new React docs. These new documentation pages teach modern React: react: Components react: Hooks react: APIs react: Legacy APIs React is the entry point to the React library. If you load React from a <script> tag, these top-level APIs are available on the React global. If you use ES6 with npm, you can write import React from 'react'.
![React Top-Level API – React](https://cdn-ak-scissors.b.st-hatena.com/image/square/b2c712cc98dd4b4358911c413bad77e850529eee/height=288;version=1;width=512/https%3A%2F%2Flegacy.reactjs.org%2Flogo-og.png)