One evidence-based way to better remember what you've learned is through Spaced Repetition, or spacing out your learning and practice of new knowledge or skills. Although this might seem novel, this is hardly a new concept; it was first described in 1885 by a German psychologist named Herman Ebbinghaus. Here's how it works. Say you plot your retention, or how much you remember of something, vs. time. Now you learn that something on day 0. Without reviewing it, the "forgetting curve" will look like an exponentially decaying curve, which is kind of scary! If you review (or better yet actively retrieve) the material at increasingly spaced intervals after learning it, then the forgetting curve starts to flatten out and you'll get a lot better longer-term retention. Now, the goal here is to review the material at the right time. It turns out that the best time to revisit information that you are trying to learn is right around the time you would naturally forget it. Since forgetting typically follows this exponential curve, the trick becomes timing your study sessions around it. Practically, this means having more widely spaced intervals between study times for the material that you are more familiar with, and shorter intervals between study sessions for material that you are less familiar with.