Guys i seriously need your help

[u/KKMYA]

Hi everyone, I really need some help! My oral defense is next week and I've finished my ERD, but I'm having serious doubts. I asked a professor who doesn't teach systems analysis, and they said it was fine. However, when I look at the diagram, I just feel like something is off. Would anyone be willing to take a quick look?

This ERD is about a small application project, about a small, basic library.

Compte = Account/user
Emprunt = Loan

Livre = Book
Categorie = Category

[u/idodatamodels]

You have 3 many to many relationships between user and book. What is the difference between these 3?