If you are into the coding part of game development I can't recommend this book enough:
If you like game design, mechanics you could try some channels:
The Game Maker Toolkit
It goes mostly about how to convey the feeling of the game to the player
Although it is focused on open source tools and engines like Godot, there's a lot a valuable material there about art and programming.
This one i think is great, but he talks a lot about unity and is mostly focused on that. Lots of valuable content there too.
I believe Extra Credits has some old game development playlists
THOSE ARE SOME GOOD RESOURCES YOU HAVE THERE.
Thanks a lot! I'm sure to reach for your help if ever I got stuck. ^
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