When I was 17, I was mostly having a good time, working casual jobs and studying. My advice is that React might not be around forever (it also could be, I'm not prescient), so try broadening your knowledge a bit so you can become a generalist able to work in any environment. Build some toy programs in other non-web languages like Python, C/C++ (if possible), and study basic algorithms (they'll help you no matter what you end up doing).
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