The best way to take notes is to not do it during the class. Pay full attention only to the teacher/speaker during the class/lecture and make a conscious attempt to remember everything they said. Immediately following, get together with 3-5 like-minded friends and attempt to as a group write the entire lecture from start to finish from memory. If no one can remember something, skip it.
It takes a few weeks/months to develop your focus, attention span, and memory enough to be able to get near 100% short-term retention, but you start to see benefits almost immediately. And the long-term benefits to your memory and focus can't be understated.
Also, it's really interesting how many other people are expressing that they never took notes in college. I was famous for it in my college (my advisor wrote a paragraph about it in grad school recommendations), whereas I always thought it was common sense, seeing other people who spent the whole class scribbling, but didn't really understand a bit of what was actually taught.
I think this kind of approach can only work in certain situations and modes of teaching. For biology or anything that requires more memorization than conceptualization, I think it is key to have a running tab of the topics/key points. This is especially key for fast speaking lecturers or topics that you are just being introduced to. I think your approach is really helpful in topics that are more conceptual. Math, CS, and logic are much better learned with full concentration.
That said, I think pre-studying and post-studying immediately before or after class is really, really helpful - regardless whether notes are taken. The only challenge is that it takes much more time and a lot of effort. This is another clear example of the relationship between effort and reward.
I preferred to scribble in the margins of my notebook during lectures; not words or likenesses of anything in particular, but kind of Hugh Macleod-ish pattern scribbles[1]. Some teachers really hated that I wasn't looking up at them and thought I was being super disrespectful, which didn't make sense to me since I was asking questions that clearly indicated I was paying attention.
Ah yes, I learned to do this as well with certain professors. I always found the ME professors were impressed after the first lecture and could tell I was paying attention. But with some others, it was a different story.
It takes a few weeks/months to develop your focus, attention span, and memory enough to be able to get near 100% short-term retention, but you start to see benefits almost immediately. And the long-term benefits to your memory and focus can't be understated.
Also, it's really interesting how many other people are expressing that they never took notes in college. I was famous for it in my college (my advisor wrote a paragraph about it in grad school recommendations), whereas I always thought it was common sense, seeing other people who spent the whole class scribbling, but didn't really understand a bit of what was actually taught.