My habit is to take notes while reading. When I write enough words for a card, I’ll start a new one. So technically, you can split a book into tons of cards. As for those books without much information, maybe two or three cards will be enough.Normally, the first-level tag is “Book”, and then the name of the book, and that of the chapter. If necessary, I will add the page.I will write some comments. If my comment is short, I will use brackets and write my comment in it. Otherwise, I will change a line and label it as a comment.The advantage of comments is that you can distinguish the information and your understanding.