can anyone recommend me a good youtube series that goes over the paramters/layers all that shit that goes into making toggles work correctly?

Honestly even though I make toggles on my avatars I only ever follow some guide that just says click here do that and it just works, but I honestly have no fucking idea what I'm actually doing. Like all the shit that goes on in an animation controller, in the paramaters itself, all the nodes I make, I have 0 fuck all idea what any of that shit is actually doing I just blindly follow steps. I'd rather actually know how all that crap is working so I can mess with it myself and do more complex stuff with it