Hello guys, if you want to learn React.js and looking for free resources like online courses, books, and tutorials then you have come to the right place. Earlier, I have shared best React courses, books, projects and best places to learn React.js for free and in this article, I will share best free online courses to learn React.js on Udemy. Before we get to the 10 best free React courses on Udemy that will teach you everything you need to know about React, let me tell you what it really is. For those of you who don't know, React is basically a UI development library that is based on JavaScript. It is maintained by Facebook and an open-source developer community. You can think of React as a library that behaves like a programming language.