For non-fiction, I've found that underlining engages me more and causes me to retain the information to a higher degree than when I'm "passively" reading. For

For non-fiction, I've found that underlining engages me more and causes me to retain the information to a higher degree than when I'm "passively" reading. For some books I'll also use the margins or even bring along a pad of sticky notes. I tried actually taking notes while reading, but it ended up requiring too much setup for me to engage with as often as I'd like.