Comradeship // Freechat

I'm getting back into the rhythm of reading more consistently. I generally read for about 30-40 minutes in bed right before sleeping on my e-reader, regardless of fiction/non-fiction.

This made me think, for people who prefer physical books, do you underline, highlight, take notes in the margins, etc. when reading theory?
Back when I did have a few physical books I never wrote anything in them, I guess to keep them in "good" condition. Even in school books I only answered exercises in pencil, lol.

So I'm wondering: what approach do you have for reading theory?

1. Is it more like reading and absorbing the information more passively, where you read in bed, at a park, while commuting, etc.?
2. Or do you treat it more like studying where you're sitting at a desk or at a library, pen in hand with notes and such?

I'd love to hear your thoughts/approaches/advice regarding this.