As far as new web frameworks and libraries go, React is quite the runaway success. It not only deals with the most common problems developers face when building complex apps, it throws in a few additional tricks that make building the visuals for such apps much, much easier.

Learning React is designed to provide you with a complete understanding of the React JavaScript library and how to leverage it to build professional web sites and web applications.

Build your first React app
Create components to define parts of your UI
Combine components into other components to build more complex UIs
Use JSX to specify visuals without writing full-fledged JavaScript
Deal with maintaining state
Work with React's way of styling content
Make sense of the mysterious component lifecycle
Build multi-page apps using routing and views
Optimize your React workflow using tools such as Node, Babel, webpack, and others