React.js free resources

Question

Dear Sololearn community!
Since React.js became very popular js framework, I ask you for a favor.
Here, in this Q&A I would like to start a place, when we can paste a GOOD React.js resources for learning it.
I will be greatful for all of the resources! Tutorials, video tutorials, courses and so on.

Answer 1

First tutorial for beginner
https://reactjs.org/tutorial/tutorial.html#how-to-follow-along
Reactjs tutorial - a lot of good tutorials here
https://www.tutorialspoint.com/reactjs/https://scotch.io/tutorials/learning-react-getting-started-and-concepts
Reactjs common codes
https://reactcheatsheet.com/
Reactjs with Mobx component- must have data access component
https://mobx.js.org/getting-started.html