What programming language do I make my game in?
I am new to Itch so it would help if you could give a thorough explanation.
Thank you!

You can make your game in any language you like, on itch.io it doesn't matter.

If you're asking what language to pick, that depends on what game you're making, what platforms it should be for, and what skills you already have. Well?

See an earlier post that I made.