There are many types of fortune-telling. Take the most common eight-character fortune telling as an example, which involves many related books, such as "Ziping Zhenchuan", "Yuanhai Ziping", "Di Tiansui", "Shenfeng" "Tong Kao", "Qiong Tong Bao Jian", "Exploring the Origin of Numerology", "Five Elements Jing Ji", "Three Ming Tong Hui"... etc., there are too many. This is not a book like looking up a dictionary. It has to be learned.