Since it is the "corner" of books, generally speaking, there is no need to put some complicated books, and it is easy to put some commonly used books that interest you, mainly using the spare time in daily life. Over time, you will gain something. Of course, what kind of books to put depends on your interest. In addition, we should also consider the quantity of books. Generally speaking, a long speech is not appropriate. Like short stories, myths, two-part allegorical sayings, poems, dictionaries (you can look things up at any time), it mainly depends on your usual hobbies.