What does master mean among the people?

The phrase "the master is in the folk" means that many people with superb skills and professional knowledge are not in the professional field, but hidden in the folk. They may not have formal professional certification or higher education, but they have knowledge and skills in specific fields. For example, some folk masters have high attainments in literature, art, music, martial arts and other fields.

This sentence emphasizes that the people have many talented and capable people. They may not be officially recognized, but their abilities and skills cannot be ignored. In addition, this sentence also implies that people should not only pay attention to academic qualifications and certificates, but should pay more attention to practical abilities and skills.