There are many ancient books, and China's ancient books are divided into subsets of classics and history, among which the collections record a lot of knowledge in this field. Generally speaking, there are very few unified systems of various dynasties, but there are certainly such books, but they are basically ancient books, which look very difficult. Here is a book called "Ancient Chinese" by Mr. Wang Li. In the general part, many ancient official ranks, cultures and systems will be introduced.