How to Trim lengthy topics while making notes
 

Hey there!
Sanguine, everyone here would be doing well.

Qualified members and senior aspirants are requested to confer their altruistic guidance regarding how to limit the length of certain lengthy topics in notes making to short and concise ones? Like, some of the threads in case of IR part-2 demand quite a much time to go through them and extract points, essence, to grasp their soul by heart during revision. Large time means colossal data which ultimately means lengthy and soporific notes.
May I be enlightened, how should I bring the length of those topics to only a page or two?

Thanking you!

put simply, the real purpose of notes making to retain key ideas, jargon, figures, and relevant theory, so after preparing a topic, extract all these key instruments on one page which account for all core aspect of the topic.