Do you have tips to start using notebooks instead of marking books? I personally like to underline stuff in my books, when I start a new novel it's often people, places and events. I'm not sure what would be the notebook equivalent of that. Writing down what I would underline? It seems tedious and you loose context and the sense of proximity between words.
For my textbooks, I use little record cards. I write the book reference on the top line, then whatever notes or quotations etc. If it's a heavily referred to book, I sometimes use different colour cards to mean different things.
When I return the book to the library etc., I take all my record cards out and put them in a little perspex index box.
Sometimes I use the record cards to then start some more detailed notes in a notebook; sometimes the record cards refer to a page in my notebooks where I've attempted a derivation etc.