Avionics

Hello there,
I’m not so noobish in terms of knowledge of the militairy jets.
But i need information about avionics cause I know little about it.
I have severall questions like “how they work” and “what kind of types there are”.Not only about avionics, but you can tell olso things that are militairy-jets-related , i allways can learn more.

In fact I need an “avionic lesson” if it’s possible.