What is the important value of Manchu in history?

Commonly known as "acyclic Manchu" or "old Manchu", it is a pinyin character used by Manchu in China. The number and shape of Manchu letters are roughly the same as those of Mongolian letters. Among the ancient books and documents in China, Manchu ancient books and documents belong to the largest number of minority languages, which have important historical and cultural values in terms of quantity and variety.