What are the characteristics of Confucius' old book network mainly realized through application?

They are all cheap books. The website features Confucius' old book network: "rare books are gathered", "books are cheap" and "irreplaceable". The so-called "rare books collection" refers to a large number of ancient rare books with collection value (rare books in Ming and Qing Dynasties, rare periodicals in the Republic of China, celebrity ink, rare books in the Republic of China, out-of-print books, etc.). ) is displayed and traded on the empty internet, and has attracted a large number of scholars, researchers and bibliophiles to pay attention and participate online for a long time.