There is no point in being an expert in those topics right away, but the more you dive into React, the more you’ll need to master those.
I will mention a list of things, with pointers to articles I wrote that can help you get up to speed quickly:
- ES Modules
- The basics of asynchronous programming: callbacks, promises, async/await
- Arrow functions
- The spread operator
- Destructuring assignments
- Object literals
Download my free React Handbook!