What is the secret door of a fortune teller? What does this mean?

Taiyi, Qimen and Liu Ren, also known as the "Three Moves", are the three unique skills of China in ancient times. Qimen prevailed in the Southern and Northern Dynasties. Daoism, which originated from the battle between the Yellow Emperor and Chiyou, is called Huang's highest level of foresight, and it is a relatively complete model for the ancients to understand the time, space, image, numbers and truth of the objective world. Unique from the military, covering the four factors related to the success or failure of things, such as weather, geographical location, human harmony and natural help, in order to achieve the goal of surprise. Odd is three odd, that is, three odd are represented by B, C and D in the sky respectively; There are eight doors, namely, open door, closed door, open door, injured door, Dumen door, Jingmen door, dead door and surprise door.