Big cities have many things that small cities can't see, including thinking ahead of time, which can broaden your horizons. It is also possible to meet better people and expand your network resources with them. Isn't there a saying: who you associate with determines the height of your view of the world. Broaden your horizons, a person's future will be broader.
At the same time, a person who studies in a medium-sized city or a small city often leads a comfortable life and even thinks highly of himself. "I am a college student", but people who study in first-tier cities often feel pressure, because he has a better chance to see or get in touch with people who are better than him, so that he can feel his own shortcomings, stimulate his sense of competition, work harder and succeed more easily.