If only I had a pensieve. As it is, I will have to transfer knowledge the old-fashioned way.
There is a study of old magics in my world called Occlumency. It is the act of closing ones mind against magical attack. In my Dreams I am a Master Occlumens, and Professor of Defense Against the Dark Arts as well as Potions at a prestigious wizarding school. At one point I taught Occlumency to a student.