You can train in machinery. After completing relevant courses, students can ask institutions to apply for examiners' examinations on their behalf. After the examination, those who pass the examination will be issued relevant certificates by the professional talent certification center to prove that the applicant has obtained the corresponding level of sorting service ability, and the sorting staff can carry out institutional training. The certificate issued by the professional talent certification center, the professional talent certification management center is jointly established by institutions, social organizations, industry associations, well-known universities and other units, which is more authoritative and highly recognized by the society. Such certificates issued by the organizers are filed online and can be inquired. Training institutions issue their own certification certificates, which are issued by training institutions to their own colleges. The market recognition and credibility are relatively low.