@Sharon2055
Lots of previous discussions about that here...just type smart locks in the search the community box at the top.
Lots of options for smart locks, but many Hosts use:
Schlage Encode
Yale Assure
Eufy Video doorbell/smart lock combo
Kwickset Halo
I have used the Schlage, Yale & Eufy locks and all work pretty well. I have not used Kwickset Halo. Yale & Schlage are accepted for smart lock integration with Airbnb.
Connect a Smart Lock to Airbnb
https://www.airbnb.com/help/article/3478