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React is a JavaScript library developed by Facebook for building modern applications. It takes care of the view layer and can be used to create both web and mobile applications. In the United States, React Devs make, on average, $100k a year. There will be many resources included in this post, including YouTube videos, eBooks, Courses, and more. The official documentation for any programming language or framework is the best source of information since it was written by the person who developed that technology, so it has almost no mistakes in programming.