I'm stuck on FCC's React challenges

Hello there. I totally don’t understand what’s going on in React challenges section and I’ve decided to look for other cources to learn React, complete them and then go back to FCC.
I started Wes Bos’s “React for Beginners” already and I’d like to ask - what courses/learning material would you recommend to understand the basics of React? And if by chance you’ve completed Wes Bos’s one - what’s your opinion on it? Thanks in advance.