This is a free PHP PDF tutorial in 9 chapters and 29 pages. This course aims to give students the basics of PHP concepts.
This is a pretty short book, but we're going to cover a lot. In just a few pages, we're going to create a simple clone of Twitter.
If you are keen to learn React from the ground-up feel free to check Learn and Understand React JS on Zenva Academy which covers all the basics + lots of bonus topics like React Router and Flux.