Reading nonfiction books has gotten harder for me over the years because I've kinda driven myself into a "deep read or don't read at all" mode, so I don't read shallow books anymore, and don't do the thing I used to 20y ago of rapid-and-rude scanning and making notes of gist.
Conversation
Replying to
Why not just read til you get enough of what you need and stop? I do that all the time as most non-fiction books don't need to be 200+pages to communicate their point/knowledge.
1

