Whether or not to take notes depends on you. Some think it helps, some do not.
I take notes not to go back and read them, but to force myself to remember what I read. I generally paraphrase, make abbreviations, and write sloppily (i.e. I could probably not re-read my notes anyway), but this forces me to remember what I just read. If you take notes, even ones that are meant to be re-read, it should only take a few seconds.
My suggestion is to work through the OG and try taking notes. See if it helps you.
I hope that helps
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