ReactJS, Axios, 7:1 architecture, SASS, RWD, React-Router

Just learned React, and REST APIs, so to put what I learned to the test, I present my first project in React JS. Suggestions and criticisms are highly appreciated, so I could grow even more.

Questions:

• Optimal way to use APIs, cache the entire data for later use, or just take what you need for that current render?

• Styled Components or 7-1 architecture for styling components in React?

• Did I refactor my code too much, or does it need more refactoring?

• Is my code properly decoupled, easy to maintain and scalable?

• Should I bother learning more webpack, or is CRA enough?? (I don't feel like that I need webpack right now, and CRA makes my life a lot easier).

I didn't add any animations this time, since it's pretty hard to maintain a balance between school (due to new normal) and coding, so forgive me if the renders are too flat.