Iin the US, "parking space" means a marked area the size of a single car in a parking lot, and it is usual for that. "Parking spot" means a place to put your car, especially if there are no lines involved. "Parking slot" is unknown.
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Iin the US, "parking space" means a marked area the size of a single car in a parking lot, and it is usual for that. "Parking spot" means a place to put your car, especially if there are no lines involved. "Parking slot" is unknown.
A "slot" is usually more of a narrow space, for example in a mailroom the mail is sorted into slots.
I would consider parking slot to mean the same as parking space, a marked area within a parking lot (BrE: car park) for one car to park in.