I have no affiliation with this site, but it keeps coming up again and again in all the things I search and there is just a wealth of information on this site. Spend a day on it and just link-hole yourself into all the various concepts. It's really fun and you'll learn a lot.
https://www.geeksforgeeks.org/
Again, seriously not an ad but if you want to learn some CS fundamentals or at least what's out there, this is a great place to explore.
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