Open hinge method of determining swing
The easiest way to determine the swing of a door is the hinge method: Open the door. Standing with your back against the open hinges (not the butt of the hinges). If the door is to your left, it is a left-hand door. If it’s to your right, it’s a right-hand door.
The chart below from Home Depot shows inswing and outswing entrance doors
The chart below shows how to determine which is the active door in a patio or French door.