1. First, stick the damaged part of the cover with transparent adhesive.
2. Then fold the small note into small pieces of paper.
You can see the crease clearly when you open the book. Stick a small piece of paper on the crease with double-sided tape and stick it where the stapler can get it.
Finally, close the textbook, aim at the position of the small pieces of paper on the textbook, and staple the book with a stapler.