@Heather1066
First thing is to check if your email was breached on a site such as
https://haveibeenpwned.com/
If you are in the habit of always using the same password, your airbnb account can be hacked by criminals using credential stuffing software, likely to be the source of the compromise.
On viewing your airbnb account, you can see that there are some personal details listed and available to see.
Bank details show only last four numbers. Passwords are not listed.
You can review airbnb notifications that can alert you whenever a new device is used to log in.
If you are an occasional user as a guest, it's good practice to remove payment details when not using your account.
Usually the point of hacking is to divert genuine payments due to hosts, collusion bookings to fraudulent hosts, to launder stolen bank cards through airbnb or simply pure mischief.
Do check over airbnb messages including archived messages for any further suspicious changes and call the service centre to report