Checking your user status will show you wich documents you have borrowed, their due dates, pending and available holds, blocks (fines) and it will let you cancel reservations you are no more interested in, and see answers to Library requests.
See due dates of your borrowed items and renew any or all of them if you need to.
See your reservations in "Requests" tab, and due date:
If you returned some item out of date you will see the block (fine) and final date.