Recording history depends on literature, physical materials, oral materials, etc. What are the advantages and disadvantages of various materials?

The documents are old and there may be gaps. This is the most important means to study history. For example, it is an indispensable and extremely important method to study the social figures at that time to record the rise and fall of dynasties and the miscellaneous notes of characters in China's history books.

Physical materials are also examples of things indispensable to the study of history, but they are rarely preserved and difficult to maintain because of excavation and other reasons. Not comprehensive.

The advantage of oral materials lies in recording historical parties with modern tools. This is living history. Similarly, the lack of his oral information also requires a lot of manpower or material resources to search and record. It is difficult to operate.