It should be noted that books related to the Book of Changes are not easy to read, and it takes a lifetime to read them several times. It's not because you have high academic qualifications or high IQ, nor because of rote memorization. It lies entirely in the word "enlightenment", that is, fate and wisdom …
Pay attention to the marks on the map. It can be said that these fortune-telling books are all written by them, and they are all electronic fortune-telling books.
I think the basic theory of fortune-telling primer is the most easy to understand. After getting started, we should focus on reading the ancient books such as Tian Di Sui, Zi Ping Zhen Quan, Poor Bamboo Slips, The Book of Changes, etc. Lay a solid foundation of yin and yang and five elements.
The essence of six hexagrams' fortune-telling is very rich in ancient books, especially The Seven Classics of Yi Yin, True Classics of Divination, Addition and Deletion of Divination, Addendum to Yilin, Yi Mao, The Forest of Fire Beads and Breaking the Secret.