I just accept that I won't understand everything and will misunderstand some of the things I think I understand and that many of the things I understand I will understand differently in the future of a few days/weeks/years because of other things I have learned or read in the interim...

...or to put it another way, I read a lot of things I don't understand and largely because I seek them out. Though that doesn't really align well with formal academic schooling as seen by students, outside of school there aren't Tuesday quizzes on last weekend's reading and subjects don't end after sixteen weeks (or last that long either)...and terms I don't know I'll eventually figure out from context. Except for monad.