One is a young, free upstart offering. One costs money and is part of a comprehensive, established online learning site. Here's a comparison of my experiences with React.js Fundamentals by Tyler ...

React is not an end-to-end JavaScript application framework. It has no support for models or controllers, although there are projects related to React that cover these functions, along with routing.

Beyond the usual quick tips, let's look at both the business case and the technical side of keeping React bundles lean.

Now, here’s where the special nature of React comes in. Besides normal HTML, CSS, and JavaScript, the bulk of your React code will be written in JSX.