This led me down a real rabbit hole of looking at what you can do with git commands, very neat.

There’s a few more things you can do which I found, like switching to the Nth branch you last had checked out: https://www.w3docs.com/snippets/git/how-to-checkout-the-previous-branch.html

It sounds a bit plain and boring, but if you’re just wanting to learn the basics of C# then you could refer to the official Microsoft docs:

https://learn.microsoft.com/en-us/users/dotnet/collections/yz26f8y64n7k07?WT.mc_id=dotnet-35129-website

They’re quite basic, but do offer some fundamental knowledge. If you’re after more theory such as architectural patterns, I’d say you’re better off looking at resources that are language-independent