I think that is what Feynman technique is much about. You spend time writing questions of what you still don't understand recursively until you have understood

I think that is what Feynman technique is much about. You spend time writing questions of what you still don't understand recursively until you have understood it all. It begins by understanding what you don't understand. Once you understand something after spending time trying to understand it and writing down your understandings and non-understandings, you typically have little problem memorizing it.