Graves don't need doors, they can't be seen or entered. What you are talking about is an important issue, whether it is a peak or a trough. I never talk about the gate of the grave because it is meaningless. What matters is the sitting direction and orientation of the tomb. It is best to sit on the hill far away from the water, that is, facing the south valley; Sit by the mountain, facing the mountain, not the tip. In fact, the grave door you mentioned is the location of the monument. The location of the monument is very important, and it can't stand in the south direction, which will put pressure on the wealth and career of future generations. The best place to erect a monument is due north, followed by southeast and southwest. This is a secret that many experts don't understand. Now it's public, that's what the master meant.