I don't think there's any such thing as teaching people photography, other than influencing them a little. People have to be their own learners. They have to have a certain talent.
My mind is vacant on names, but I know him as well as anything. When I need names they drop out of my head; when I don't need them they drop back.
I was poor. When you're poor you work, and when you're rich you expect somebody to hand it to you. So I think being reasonably poor is very good for people.
Oh, you ask me, what is the greatest torture of a person who does portraits for a living? I could fill several volumes with nice nasty stories. I don't know.