To put it bluntly, it is to teach you how to work.
Vocational training is to cultivate the vocational skills of trainees. The purpose of vocational training is to enable trainees to acquire or improve certain vocational skills, not to cultivate their cultural level. Of course, some vocational training methods related to cultural quality education (such as vocational and technical school training methods) also teach cultural classes in high schools at the same time, but this is only a combination of vocational training and general education, and does not change the purpose of vocational training.