What is the main content of the Book of Changes?

The Book of Changes is about divination.

The Book of Changes was originally used for divination and weather forecast, but its influence spread all over China's philosophy, religion, politics, economy, medicine, astronomy, arithmetic, literature, music, art, military and martial arts. This is an all-encompassing masterpiece.

The Book of Changes is essentially a book about changes, which has long been used as "divination". Later generations know more about his philosophy, thus becoming a profound dialectical philosophical work. "Divination" is to predict the development of future events, and The Book of Changes is a book that summarizes the laws and theories of these predictions. The Book of Changes is an outstanding representative of China culture, and China culture is all-encompassing.