Some only remember the author and title, some simply introduce the content and era of the book, some introduce the author's life and academic experience, and some carry out edition appraisal and value evaluation of the book.
If the general ancient books are divided into a subset of classics and history, there are other subcategories under the subset of classics and history, such as the Thirteen Classics and their related notes, which are arranged in the order of times and dynasties. If many books need to be indexed,
If it is a modern book, there are many classification methods, which can be divided according to what economy, society, astronomy and geography. You can use the China Library Classification and attach a link to it. /view/ 1602 10.htm
However, at present, the general catalogue of books is still the catalogue of ancient books or modern books in the Republic of China, and it should be more appropriate to divide the historical subset into two or three levels.
Finally, if it is a western-language bibliography, it can also be divided by author or initials.