In New York City, there are three public library systems: the Queens Public Library (QPL), the Brooklyn Public Library (BPL), and the New York Public Library (NYPL).
I only had a QPL card until the pandemic, when I signed up for an electronic NYPL card. Oh, the doors this card opened. This card was being used and abused on a weekly, if not daily, basis. I was glued to Libby.
Until recently, I was content with just having these two. Then, I got greedy and started reading The Apothecary Diaries and a plethora of manga series. I didn't have enough holds slots, the wait times were several months long, and there were titles I couldn't find.
FYI, QPL and BPL allow you to place 10 holds and have 20 loans at the same time. NYPL only allows 3 loans and holds each.