What is the basis of fortune telling?

Fortune-telling is a slightly mysterious metaphysics, based on the Book of Changes and the system of Yin-Yang and Five Elements. Zhouyi originated from Fuxi Bagua, and Fuxi Bagua originated from He Tu Luo Shu. The Book of Changes says, "Rivers paint, Luo writes, and sages write." We can see the development trend of China's culture from calling for Tam characters to symbols of eight diagrams to interpreting eight diagrams, which is a way of thinking that naturally follows laws and enriches people's experience. The theoretical basis of fortune telling is "Yin-Yang and Five Elements", which is the core of China's classical philosophy and an ancient and simple materialistic philosophy. Yin and Yang refer to two opposing and interrelated forces in everything in the world. The five elements are composed of five basic substances: wood, fire, earth, gold and water, which emphasize the overall concept; The combination of Yin-Yang theory and Five Elements theory constitutes the framework of China's traditional thinking. According to the natural principle of Yin-Yang and Five Elements, it is transformed into the sexual and personnel principle of Ten Gods, forming a complete fortune-telling calculation system. Prediction is to find out the law of things according to some known conditions, and calculate the development trend of things according to its law.