The Book of Changes can be divided into Yi, Lian Gu Shan Yi, Gui Cang Yi and Yi Jing, all of which have been lost except the Book of Changes! The Book of Changes written by Zhou Wenwang has been handed down to this day.
But it is not recommended that you study it, because it is difficult to understand. Now there are many well-known scholars in China who want to understand, and the results are getting more and more confused! ~
If you are a beginner of metaphysics, mainly used for fortune telling, then Wei Zi Dou Shu is suitable for the elderly. According to legend, the book of Wei Zidou was invented by Chen Tuan (Chen Xiyi), an important Taoist figure in the Northern Song Dynasty. Wei Zi Dou Shu, formerly known as "Eighteen Flying Stars", came into being a little later than the five-star technique, and was influenced by Indian astrology at the same time as Zi Ping (eight characters and four pillars). Compared with the eight characters, there are far fewer works about the number of fights in the past dynasties. Due to the lack of information, the source and inheritance of the number of fights are not clear.
Today, this subject has been accepted by most people. You can know how popular it is by searching online, and it is relatively easy to learn. And it is not as abstract and complicated as other academics ~ the most important thing is that it is quite accurate! ~ if you are interested, you can go online and have a look ~