What do the classics and sub-histories of Long Wen Whip Shadow refer to? Please, thank you.

Classics naturally refer to Confucian classics, while Zi Shi is a hundred schools of thought and a historical work respectively. The so-called four-part method of "subset of classics and history" was first produced in Wei and Jin Dynasties. Although it is four sentences and sixteen words, it is unobtrusive and simple, but it really tells the educational purpose of this book and puts forward the learning goals of primary school students. In fact, even from these sixteen words, it is a rare good book, which is related to the traditional culture and history of China. Learning from it is a pleasure? Confucian classics refer to the Book of Changes, The Book of Songs, The Book of Songs, Zhou Li, Yi Li, The Book of Rites, The Spring and Autumn Annals, The Analects of Confucius, The Book of Filial Piety and other Confucian classics, which are important materials for studying the ancient history of China and Confucian academic thoughts. It refers to the "subset of Confucian classics", that is, the four categories of ancient books in China. Some large-scale ancient books series often include four books and are named after them, such as Four Ku Quanshu, Four Series and Four Essentials. It can be seen that the four categories are of great significance to ancient books.