After the age of 35, programmers' brains and physical strength can't keep up with young people. They can't accept working overtime to 12 every night, so many enterprises don't want to get old. Although the computer has been updated, the so-called "changing the soup without changing the medicine" is still the same, no matter how it changes after careful study. Training teachers can train many things, and it is most important to take students to do projects. What matters is their experience.