How does Huangdi Neijing explain the theory of Yin and Yang?

Huangdi Neijing says: "Yin and Yang intersect without leaving the center", "Heaven and earth are the senses, and everything is biochemical". Everything is a combination of yin and yang. Yin and Yang are the source of life, and they are "the way of heaven and earth, the discipline of all things, the parents of change, the beginning of life and death, and the home of gods." The "God" here is not a ghost, but a spirit. The "Su Wen" in Huangdi Neijing further explained that there is yin and yang between heaven and earth, and there is vitality and vigor, so the breath in the air will roar and flow, and the vegetation will flourish. There are intangible vitality such as wind, cold, heat, humidity and dryness between heaven and earth, and tangible substances such as gold, wood, water, fire and earth. When "Qi" and "Shape" intersect, they will be transformed into colorful things. In short, "life is tangible and inseparable from yin and yang, heaven and earth are in harmony, and everything comes together." From the endless space to the endless sun, moon and stars; From winter to summer, the cyclical seasonal changes, to endless animals and plants, the source of their life is the "hiding place" of Yin and Yang.