A good teacher finds the kernel of knowledge at the center of something, and teaches you that so that you can synthesize/derive the rest of it. Doing that isn'

A good teacher finds the kernel of knowledge at the center of something, and teaches you that so that you can synthesize/derive the rest of it. Doing that isn't easy, and it generally requires a very rich understanding of the domain. If you find a teacher that can do that sort of thing, you're very lucky.