That’s what you get for not buying the very latest edition of the textbook. /s

Seriously though, you’re clearly trying to actually comprehend the material, but even the professor was too checked out? I wish I were surprised, but that’s just upsetting. Nobody takes responsibility for education anymore, not the instructors, not the administration, and none but maybe a handful of students who get zero support from either of the above. I’ve learned more from reading on the internet for free than I have from any classroom. But learning for free on one’s own doesn’t give them a fancy paper that attracts employers. Gotta spend money to make money, yet again.