One of the cool things about React is it focuses entirely on the component rendering process. I love that because it somewhat follows the single-responsibility principle. It renders components to the screen within a web application, but it doesn't worry about routing, state management, or other tooling often necessary to build out an entire front-end application.
The tradeoff is that it can be somewhat complex and overwhelming to put together a React app from scratch. But, fortunately, there are plenty of ways to get started without beginning at the ground floor. To keep digging into React, check out the list of references below: