How to judge whether the door on Feng Shui is open on the left?

In geomantic omen, opening the door does not refer to the opening direction of the door leaf, but to which side of the room the door opens. Because the orientation of the gate is known as "the former Suzaku, the later Xuanwu, the left Qinglong and the right White Tiger" in Feng Shui, it is usually said that the Qinglong is in a good position and the white tiger is in a bad position, so it is generally avoided to open the right gate in Feng Shui.