React JS is a JavaScript library used for front-end development. It is created and maintained by Facebook developers. If we want to create a single-page application (SPA), React should be the best option. It also allows us to reuse our UI components. In this ReactJS tutorial, we will begin with prerequisites such as HTML, CSS, and JavaScript. Then, we'll go over the fundamentals of React JS, SPA, and React installation. Finally, we'll go over the folder structure of React and JSX, as well as how to create and reuse components.