title... How did y'all learn? I want to participate in a jam A LOT. I have a lot of experience in shader languages and opengl, but I don't know how game logic is really implemented using unity objects and such 

GMTK's video here is great for Unity. Even though it says for absolute beginners, I knew how to code going into it and still got a lot out of it.

Personally, though, I'd recommend Godot—I 've used both and like Godot a lot better. The official Godot documentation is pretty good, too.

If it's your very first jam, and you literally have no experience with game logic I'd suggest you use : microstudio.dev

It is a nich, web hosted open source game engine that has the bare necessary features for doing game development. 

If doing everything by hand for someone starting gamedev sounds like a bad idea and you'd rather start with something with a lot of premade components for you to use, then you fell into the same trap most gamedevs amateurs (me included) fell into.

Long story short, if you do not know game logic nor how premade components work under the hood, when it comes time to debug you will be in hell. 

I know almost nothing about shaders, so if microstudio doesn't give you the tools you want to make your game, I would suggest going with godot over unity simply because it's lighter and got much better doc. 

Even then, before the actual gamejam start, messing around with microstudio to understand the basics of gamedev would only be to your benefice.