1) what do i have to know to be a good react native developer?

2) what level of javascript knowledge do need to have to understand react native?

3) how hard is typescript/ecmascript and what do i need to know to understand it? only js i guess or something else?

4) i have basic knowledge of javascript. do i have to learn it extremely well or can i start learning typescript/ecmascript along with react native?

5) tips for learning react native as fast and as efficiently as humanly possible

thanks

1) Understand reactive programming.
2) Any level. As long as you're ready to learn.
3) Ecmascript is JavaScript. Typescript is a superset of JavaScript that handles some critical things that JavaScript doesn't handle. Like types. Typescript is cool and sometimes you don't need to write tests for typescript apps.
4) You don't have to learn typescript to learn react native. Your JavaScript knowledge is enough to fire up react native apps.
5) Use a Mac. Windows computers always frustrate react native devs. Plus if you use windows, you can't run your iOS version.

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@Hubot-0x58 yeah using static types reduces bugs with about 15%. So for small scale apps you do not really need tests.
Read this interesting piece https://blog.acolyer.org/2017/09/...