What is the main content of the Book of Changes?

The Book of Changes is the oldest and most profound classic in China. It is said that Fuxi's remarks were summarized and revised (at the same time, the gossip of Yijing was produced). It is the crystallization of China's 5,000-year-old wisdom culture and is known as "the head of the group classics and the source of the avenue". In ancient times, it was the study of emperors and a required skill for politicians, strategists and businessmen. The Book of Changes is essentially a book about divination. "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 one of the four books and five classics of Confucianism. According to the documents of China [1] Junyou Association, it is said that when Qin Shihuang burned books to bury Confucianism, Li Si was spared because of the inclusion of Zhouyi in the book of medical divination. Later, people in all previous dynasties studied Zhouyi, including Fang Jing and Zheng Xuan in Han Dynasty, Wang Bi in Wei and Jin Dynasties, Lu Deming, Li Dingzuo and Kong in Tang Dynasty, Shao Yong, Cheng Yi and Zhu in Song Dynasty. According to documents, Yi Tu's research rose in the Song Dynasty, such as the famous river map, Luo Shu, congenital map, transit map and left sky map. Sixteen pictures after the wind. Pornographic pictures in the room, artistic pictures. The map of the day after tomorrow, the map of Taiji (including the cake pattern of Yin and Yang fish) and the map of Dragon Eight Diagrams are not available in the original book of changes, but were added by later generations according to their own understanding of the book of changes. The study of Zhouyi in past dynasties can be roughly divided into two schools: the school of righteousness and the school of image. The rationalist school emphasizes that hexagrams, epigrams and epigrams are explained by the meaning of their names. Elephant Mathematics School pays attention to explaining hexagrams and speeches from the images symbolized by gossip. Others think that the school of righteousness discusses the philosophical value of Zhouyi, while the school of mathematics focuses on divination with Zhouyi. The former is Wang Bi and Cheng Yi, and the contemporary is Liu Dajun, a professor at Shandong University. The latter such as Fang Jing, Shao Yong and so on. At the end of the Ming Dynasty, the Book of Changes was translated by missionaries and introduced to the West. 1at the end of the 7th century, the German philosopher and mathematician Leibniz explained the Book of Changes in binary because of the introduction of the sinologist Buwei (Bai Jin in Chinese, 1662- 1732). Nowadays, many people in Chinese mainland, Taiwan Province Province and western countries have studied the Book of Changes. According to Jiang Hongyuan's textual research on the changes of the Book of Changes, Zhu, Huidong and Si's summary of the General Catalogue all think that the book and its chapters have been written by myself since the publication of the Book of Changes. This book is extended by Shen Yanguo's argument, and it is determined that Fang Jing is based on 60 hexagrams headed by 12 hexagrams, and repeated at the rhythm of 60 minutes, while Bagong hexagrams, Najia and Yinna evolved from another non-Shi Jing school, such as Xun Shuang, Yu Fan and Gan Bao, and replaced the original pattern of Fang Jing after the appearance of Shi Jing Yi Zhuan.