If you want to learn divination, where should you start and what books should you buy?

From the beginning of calendar science, I know Tai Chi, Yin and Yang, Four Elephants, Eight Diagrams, Sixty-four hexagrams and so on. I recommend a book, Zheng Liu's Predicting China Yi-ology, which is the first book to systematically, deeply and rigorously introduce China's ancient orthodox Yi-ology and various predictive divination methods from the perspective of Yi-ology culture.