Blitz
Well, chess.com is definitely the right place for learning! :)
I wrote a blog post years ago about opening principles, but it also has a ton of resources linked at the bottom of the post: https://www.chess.com/blog/KeSetoKaiba/opening-principles-again
I also have a YouTube channel you can watch, but I’d probably start with that blog post first:
https://www.youtube.com/@kesetokaiba/videos
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