I am very biased against educational material on YouTube, just as I am against any material presented in video format rather than text, but nevertheless, from time to time I have to resort to watching educational video courses and documentaries.
I have realized that watching this kind of material first for the purpose of getting acquainted with it, and then watching it a second time in order to summarize all the necessary information, is very time-consuming, and often I simply cannot bring myself to watch the material a second time right away — I just get tired of it, and it becomes less interesting to me. I have to force myself, and my brain doesn’t work as well as it could. Therefore, for me, this approach is a kind of idealization of the situation, which is not always applicable in practice.
Therefore, at the moment, I simply take notes while watching for the first time. I do this in a rather chaotic and disorganized manner, and only after I finish watching do I work through them, putting them in order and compiling an organized summary of the material I had to familiarize myself with, and then I divide this single summary into separate thoughts (atomicity).
But in general, I try to avoid working with material in video format. I believe that this format is much less effective for learning than text format. Videos take much more time to work with. It is much more difficult to navigate in a video than in a text. In videos, thoughts are often formulated and voiced in real time, while text is polished to the highest possible quality.
And in terms of overall quality, videos are very often inferior to books — although there are now quite a few poor-quality books out there.
For me, the video format is only good for its visual appeal, but not all activities require such a high level of visual appeal that you have to sit and watch another person’s activities continuously — often images or inserted videos in addition to text are sufficient.
Sometimes I choose this format for entertainment, or when I simply cannot read—it seems less demanding on the learner.
Therefore… subjectively, the best way to structure notes on long video material is to abandon the video material and use a book. When possible.