What is the Qi in Feng Shui and what is its function?

There are three kinds of geomantic omen, that is, the three are "heaven, earth and people". Heaven is dominated by yin and yang, tunnel is dominated by rigidity and softness, and humanity is dominated by benevolence and righteousness. The weather is hot and cold, stormy, day and night; There are mountains, rivers and mountains; People have five virtues, each with its own meaning. In nature, the image is shaped in the ground, the road becomes a man, and the road becomes a woman. Birds of a feather flock together and things are divided into groups. It can be regarded as heaven, astronomy, geography and mountains and rivers. Heaven is the principle of qi, and the tunnel is the head of Luan; Feng shui masters mostly take Luan Tou as the body and manage qi for use. Because anyone who looks at feng shui can get started (the first thing to look at is the head of Luan, and the head of Luan is not neat, so the big star floats). You can't waste both qi and chaos. The way of feng shui, mountains and rivers are the best, and no mountains and rivers are the worst. There are many factions of feng shui regulating qi, such as ternary, triad, metaphysics, divination, and regulating qi in the stars. The theory is complex, but there are reasonable and unreasonable ones, so there are differences (true and false). Those who regulate qi use three yuan and nine movements, yin and yang and five elements, and successively use heaven and gossip to reverse good and bad luck. Yang Zhai is close to the star, the main transport is Nuyuan, and the mountain flies to the star, which is used with the guest star. Yangzhai emphasizes the orientation of the door, or opening the sun as the orientation of the house, so the door is facing the air. If there is water outside the door, it is heavier than the road. Decline and prosperity are measured by water. The way of the universe originates from Yin and Yang, which are contained in the Book of Changes, and everything is transformed by the six sons of Gan Kun.