What you must know before starting with reactjs?

If you want to be a REACT dev then you must know these basic things:

1. Browser.
2. DOM.
3. Asynchronous programming & synchronous programming.
4. Working of event loop in the browser.
5. HTML.
6. CSS.
7. Javascript Basic & Ecmascript.
8. CLI/terminal commands.
9. JSX. 10.Webpack.

these are 10 basic skills that can help a lot to start with react js.