I just ask LLMs questions about things I'm curious about. I don't really want to follow someone else's predefined curriculum. A curriculum is necessary when the information has to be delivered in a lecture, but not in a 1-1 interactive setting.

If you type "I want to learn CUDA programming. Where should I start?" into Claude, it gives a pretty plausible outline. It's not clear what an app could add to it.

Same. The ability to investigate a topic from almost any angle or starting point has been really fun and helpful.