I understand this could be thought of as extremely broad since there are many types of “history books” but I am essentially just asking, how do you(historians) best absorb information while reading. Do you take notes and highlight, or do you just go straight through and try to absorb info as if reading a novel? How often do you re-read passages? Do you ever focus on certain parts of the text and ignore others? How does your strategy vary depending on the density/difficulty of the text. This question is also meant to ignore situations where one is researching and simply using texts as a reference. I mean more along the lines of reading when studying for a class or simply for the sake of better understanding a time period.
The answer to your question is going to vary considerably, depending on what sort of book you are reading, and for what purpose, but – while there is always more to say – it is certainly worth checking out a classic AH resource that deals with this query in the context of a serious historian or student tackling a serious book: u/sunagainstgold's