I borrow books from the library first and then determine if I liked the book and would want to reread it again. And if that's the case then I will buy the book. That way if I didn't like the book then I don't have to feel guilty about not liking a book I paid for. Plus if I'm really not liking a book and don't want to finish it then I can return it right away.

If there's a specific book you want to borrow and the library doesn't have it I recommend using two apps one is called Libby and the other is called Hoopla. These apps give you the choice between an ebook or audio book. So if your library doesn't have the physical book available then you have a couple of other options to choose from.

As for annotating books I love to do that. So if you find a book you want to reread buy the physical book and annotate it to your hearts content. :) That's my method of reading. :)