Comment by fluoridation

>In that sense, I wish that my prior self had taken good notes, so that I wouldn't have to dig up source material if I wanted to relearn it again.

I don't really get it. If you've truly forgotten, you have to relearn it one way or another. What makes you think your past student self improvising a half-assed explanation in the moment could do better than a professional author who was already an expert when they wrote the book?