Wow! Which ones do you have?
Computer-assisted instruction is helpful, too. The best ones have quizzes that explain the rationale for the correct answer, but also explain the rationale for the incorrect responses. Knowledge of the subject is much more comprehensive after one of those courses.
Oh, lots, mostly history and literature. I have WW1 and WW2, a whole batch on the Middle Ages, Shakespeare tragedies, practically everything on Greece and Rome, and also some on the sciences. And the wine one.
Most are on CD, so I can listen in the kitchen or the van. I don’t usually spend more than five minutes at a time on the computer! Like now, I’m headed upstairs to lie down for an hour, I hope. Kathleen finally fell asleep a minute before we pulled in the driveway.