What is a hold?
If all copies of a book are checked out, you'll need to place a hold. This will put you on a wait list. Once a copy of the book gets returned, it'll become available for the first person on the wait list.
To see all your holds, go to > Holds. From there, you can see your estimated wait time, or select Options to edit or cancel the hold.
You'll get a notification in Sora when a hold is available for you to borrow.
If you'd like to borrow a book that has a long wait list, let your teacher know. They may be able to purchase more copies of in-demand titles.