That is, how to specifically to learn about typography, typographic design (of documents, web sites, books, magazines).
I know that the question is a broad one and that one of the answers would be: to get a degree in graphic design or something similar. I have a fair share of degrees and at the moment that really wouldn't be feasible.
So I'm looking for advice from both professional designers (those who have a degree in the filed and those who don't but are professionally active in the field) and people for whom this is a hobby or something not really done on professional level.
I guess it would include books, suggestions of beautifully designed logos, books, documents, websites... and basically ANYTHING you'd have to say on topic. Things from basic properties of typefaces (x-height, whether it's a 'modern font', kerning) to paragraph design, line spacing, page margins, how to choose the font based on material... to anything and everything 'advanced' and 'expert'.
If you attended a school or a course in this type of design, I'd like to know how it helped you and what would you say are some valuable things you've learned while there.
Thank you.