@John5097 Don't feel like a dummy- things aren't always evident and Airbnb has so many screens and messaging, it's not that easy to always understand.
As far as "I'll have to rethink that again. I liked vetting guest with no reviews but then can't use one of 3 cancellations on them. "
I've read this comment from other IB hosts before. But the whole thing that hosts who are accustomed to using IB don't seem to understand is that the reason you get the 3 free cancellations with IB bookings is because you don't get a chance to read a guest's reviews or communicate with them before their booking is confirmed. You can set a few requirements, but that doesn't really assure a good fit. So things may come out during subsequent dialogue with the guest that lead to you wanting to cancel.
You shouldn't really need those free cancellations with requests because you have 24 hours in which to read the guest's reviews, converse with them through messaging, feel them out, ask them questions, and decline if you feel they aren't a good fit.
And if something comes out later after you have accepted a request that makes it evident that the guest is intending to throw a party, or break your other house rules, you can always call Airbnb and ask them to do a neutral cancellation. Not as easy as the 3 free ones with IB, but still possible.