First, you're practicing building understanding instead of collecting facts. You aren't memorizing "gravitational waves travel at cc." You keep attacking the statement until you can reconstruct it: Wait—does Earth make them? Why doesn't a static Sun make them? What happens to orbital energy? What would Brand actually observe? That kind of reasoning is transferable. The subject happens to be black holes; the mental activity is learning how to notice contradictions, interrogate assumptions, and revise models without simply accepting authority.