What is the main content of Zhouyi?

"The Book of Changes" is an ancient book of divination. The "Book of Changes" contains many historical stories of the Yin and Zhou dynasties, and most of the biographies reflect Confucian politics, philosophy, and ethical thoughts. It speculates on the changing phenomena of nature and society in the form of gossip, is rich in simple dialectical thinking, and embodies the brilliance of Eastern wisdom and philosophical thought.