Take a look at the best React tutorials .

I'd say the best way to learn React is with the best React tutorials !

The best way to learn any programming language is jumping into it and do a very small PoC on it. Personally I follow these steps, may not be applicable to you but may help

1. Spend 1 or 2 days to understand the overview, architecture, key concepts and terminology. If possible note down key concepts (For example: In React: uni-directional flow, jsx, virtual dom, props, state etc...
2. Next 2 go through some video tutorials to understand key concepts & how they code these concepts and try to relate them with your existing skills. This is something will make you to understand and remember concepts
3. Now you can start writing "hello world !". For me this is big achievement, do small programs on key concepts. This should give you enough confidence to start with PoC

Personally I believe, One will learn more when he face many road blocks and tries to solve on his own, so far it worked well for me.

Hope it helps !!

Build a real app with it. Experience is the best teacher.

When I first tackled React, I went through all the best tutorials available online. Joe Maddalone from Egghead, Tyler McGinnis' introductory course on React, the Code School course, even a few PluralSight tutorials. Although these all gave me an excellent working knowledge, nothing really made it click until I took on a project and forced myself to craft a React-based solution.

As I'm used to static CSS/HTML with jQuery/JS to manipulate the DOM for simpler portfolio sites, writing the app in React from the onset required me to answer common use-case questions from its perspective.

"How do I add CSS styling once a user scrolls?"

"How do I add local images?"

"How do I hide/show this?"

What resulted was a new appreciation for the workflow, as well as a revision to the way I approached building a page in the first place. It's one thing to understand all the inner workings and best strategies for the library; knowing how to use it as a tool is best learned from rolling up your sleeves and pushing through it!

Here's a couple courses that can help you with React:

Code School

Codecademy

Code School is a paid course (it's $29.00 a month and you can suspend your acct at any time) and Codecademy is completely free. I've taken both courses to settle my skills in React.js, and I like both. Hope this helps :)