If the level of education is not very high, it is better to learn a pure technology that involves little knowledge, so that it is easier to learn. After all, it is quite difficult to learn mathematics and English. For example, the current chef is a pure skill, and he doesn't need to learn other cultures. He just needs to practice every day. It is said that there are cooks where there are people, because everyone has to eat. Just look at the popularity of Sichuan food now.