Three things I learned to use that helped with learning quickly: spaced repetition, the Feynman method, and following practice with self assessment/quizzing. Spaced repetition when taking notes and reviewing new concepts to help with retention. The Feynman method is eli5 to see where a reliance on jargon or assumptions may mask a lack of understanding. And quizzing after practice helps highlight where more work would be best spent during the next practice or lesson.