I usually read something first without taking notes because otherwise it would take forever and you wouldn't ever finish reading it. I might briefly highlight or underline or mark certain areas of interest but that's it. After my initial reading, I try to think about it as a whole and then I go back to points of interest (if any).
It's very, very easy to get bogged down with irrelevant readings. You'll have to mostly skim through wider reading and if they genuinely seem useful, then you can properly read it and take it in.