I am aware of that. I often use the trick to register multiple times on the same website. Also, you can use (+) to create unlimited siblings of your gmail address. Helpful to keep track of spams.
I did a course on React from udemy by Stephen Girder. It's pretty good. There are three courses React, Advanced React and React Native. I think this course will save you ton loads of time. Also, it's quite cheap at 30 $ for three courses and 60 hours of content.