I had one professor in college who told us that when she was in undergrad, she would take pages of notes every lecture and then literally throw them in the garb

I had one professor in college who told us that when she was in undergrad, she would take pages of notes every lecture and then literally throw them in the garbage on her way out of the lecture hall. She just discovered through trial and error that this was the most effective way for her to learn the material. And she did well enough to become a professor at a top-20 institution. Conversely, I never took notes in her class (or any other), and that didn't stop me from doing well. The moral of the story is, people are different and find what works for yourself. There are a lot of oddball strategies out there that some people swear by, and I bet it really works for them, but you don't need to try them yourself unless you're unsatisfied with the effectiveness of your current approach.