Seriously, have a need to solve a problem or achieve a thing, that will get something into your noggin better than anything. But if you can’t do that, if you’re doing something general like studying for an exam, you can also do this:
When you’re studying something new, think of somebody you know and plan to teach it to them. Fellow students, a colleague, your significant other, anyone. As you go over the material, detail specifically how you would convey the knowledge to that person so they could understand it just as thoroughly.
Allan’s full piece is a report about an academic report and drilling down through the piece can only get you to the official abstract without subscribing. You’ve got the idea anyway.