Make two holes near the top left of the book, not too big, and two holes at the bottom left of the book, preferably four holes in a straight line, which will be more beautiful. Then use a thick rope to pass through two nearby holes, that is, from the first hole, followed by the second hole, repeat several times like sewing cloth, and then tie a stronger knot. The following one is the same. But don't put four holes together. If you don't want to open it, and there is a section protruding in the middle instead of with the top, then as usual, make a hole in the middle.