Hi,
yes, you can block dates.
But I prefer the other way around, I’ve chosen ”Dates unavailable by default” as my calendar setting, and then I open only the dates I want to be open.
I also recommend that you set the price unreasonably high for dates you have blocked. This as it is a common problem that blocked dates are ”magically” opened - and hosts receive booking requests for dates when the cannot/don’t want to host.
And whatever you do, don’t use Instant Booking. Let guests send requests to book, which gives you 24 hours to decide if the guest is likely to a good fit. If you allow Instant Booking and get a booking that doesn’t work for you, and you cancel the booking, you’ll be fined.
Good luck!