You can go for paid tutorials from udemy to learn development in reactjs from absolute scratch.The latest one being:
udemy.com/react-the-complete-guide-incl-redux
For free tutorials check this resources:
icicletech.com/blog/reactjs-free-20-online-tutori…
But make sure that you learn about redux as well as react-router after learning basic react development since it is essential to know about them in production level react projects.