At present, the professional knowledge that the library needs is library information science, and now it is changed to information system and information management. Each library recruits different majors according to its own business needs. At present, there are probably English majors, library majors, computer majors, file management majors, history majors and preschool education majors. A library has a library qualification certificate, which can generally be obtained through the library. Library grading, that is, professional title examination, is a series of examinations for librarians, administrators, assistant librarians, librarians, deputy research-level librarians and research-level librarians. It takes some time to apply for the exam. No matter what library has many posts, different posts have different requirements. For example, the cataloging department needs good professional knowledge of library science. For example, the technical department requires excellent computer network technology and so on. Which position are you interested in? However, no matter which position you want to join, you must first have a full understanding of the library. This is the first step. Secondly, learn the basic knowledge of library science. Here is a website to learn. Finally, pay attention to the recruitment announcement of the library. The library is a public institution, and its employees are official employees of the country. Its recruitment is quite standardized and strict (unless you have a hard relationship), and it can't be solved by a simple certificate or education. The general requirement is a master's degree in library science or information science. There are detailed recruitment requirements in the recruitment notice of the library. Compare them and you'll know what to do.