What is the best study tip you've ever been told or learned?

I can remember hearing in high school to "read a chapter, summarize three sentences, next chapter, summarize three sentences. Make flashcards as you go. Then review every three days, every week, every month, every six months."<br><br>I lost the piece of paper, so I got a new one every 3 months and review them all. It hasn't failed me yet.<br><br>I'd love to hear your favorite study tip. Share your success and help others.