They are the holder of the address, which is where the place is located. There can only be one place & they hold all the visits.
Each time you visit a place you will collect visits with different info of how the visit went. You can have different statuses for each visit. The last updated status on a visit will be the current status of the place.
There is no difference! We’re going to be changing places to doors in the future, but for now doors & places are the exact same.