exactly! Also, when moving/cleaning I give away a lot of the novels in my collection to local libraries/friends and give them a new life. Nobody will accept books which are written over like this, and she does that in her regular books as well, not only textbooks...While buying used books I get a lot of ones with notes written around in pencil, but usually in a way that doesnt go over the printed text, and you can either erease it or keep it, since writing in pencil is faint and doesn't disturb from reading much. What she does on the other hand, is just destroying those books in my opinion, they loose both their value and any aesthetics they may posses
Also,I didn't know about that brown noise thing, thanks guys! This is such a helpful tip, why hasn't any studytuber shared it earlier... Oh right, they don't face the same struggles as regular people who are studying lmao