“Don’t lend them to younger siblings without first securing some collateral” is my only tip. Ignore it at your peril.

Really though, my siblings have gotten a lot better about that and I’m usually too happy that they’re actually READING ONE OF MY BOOKS! to mind. Although they still get lectures if they bend the covers or tear pages. My books are mostly secondhand, so they aren’t in pristine condition…I like them like that, they feel more accessible and I’m not always worrying about how they look.

…all that to say, I have no advice…

Don’t leave a book in the bathroom either. Shower humidity is not good.

Uh oh! I guess I’d better rescue that book I borrowed from my mom, I left it in the bathroom (and I always end up steaming the whole bathroom). Thanks for the tip!

The only tip I have is don’t eat and read at the same time, you might spill something.
This one time I spilled a drink on a library book… eating and reading, bad combination…
Oh, and when using a recipe from a cook book, you might want to be extra careful, because you have a better chance of spilling something on it.