Both HTML and CSS are integral to any web development project. If you have these skills already, then learning React should be a relatively straightforward process . It has its own unique set of challenges, but it is an excellent tool to have in order to start or further your career as a web developer.
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Learning ReactJS before working with the native version is absolutely necessary . Think of ReactJS is a subset of React Native. React is for web and the native version is for mobile and desktop development. So, on top of ReactJS, react native gives you more facilities that help to make mobile and desktop native app.
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