There are quite a few "magic schools". But I have questions. Who sets the lessons? Who is doing the teaching? What experience do the teachers have?
Even this site does not have "teachers". Just people exchanging knowledge and ideas. But it is difficult,almost impossible, to really learn magic by merely reading about it. You have to be "shown" magic to really learn what it is, what it can do, and what it cannot do.And shown by real people, not videos! (Most of those are fake)
If you really want to learn, join a coven or Pagan group.