I'm prepping for a new campaign and am curious how magic is handled by others. Not mechanically per se, but how do the PCs learn about magic and how to wield it? What is the intended experience for how magic and its components are revealed to them? Do you allow PCs to see the spell list at all? Would Druids (or others) ever have a reason to share their magical knowledge with the PCs? Would the PCs ever start with any Druidic or magical knowledge at all, even by chance?

I know that's a lot of questions in there, I'm just a little unsure how PCs would come to understand the nature of magic and wield it for themselves.