What does the Book of Changes in the Four Books and Five Classics mainly talk about?

The Book of Changes, also known as the Book of Changes and the Book of Changes, ranks first among Confucian classics. Zhouyi is a book of divination, its outer layer is mysterious and its inner philosophy is profound. The author should be an official, completed by many people. The content extensively records all aspects of the Western Zhou society, including historical value, ideological value and literary value. In the past, people's understanding mode of nature and the changing law between man and saint never went beyond the thinking framework of yin and yang gossip. According to legend, Long Matuo's River Map appeared in the Yellow River, and Fuxi, an ancient sage, began to gossip. Historical Records is also called "King Jia Wen's arrest", but he acted in Zhouyi (when Fuxi emphasized divination, some said Shennong) and made comments (or Duke Zhou); Later, in the Spring and Autumn Period, Confucius wrote "Ten Wings", saying that "people are more sacred and the world is three ancient" ("Han Shu Literature and Art"). Zhouyi includes two parts: classics and biography. The text of Jing consists of sixty-four hexagrams and their corresponding names, hexagrams, hexagrams, hexagrams, hexagrams and hexagrams. There are seven kinds of ten biographies, including Xun, Xiang, classical Chinese, cohesion, divination, miscellaneous divination and virtual divination. The ancients called the ten-part tradition "Ten Wings", which means that biographies are wings attached to the classics, which is used to explain the contents of the classics.