Is there a main business that can be a part-time insurance agent?

Yes, as long as you 18 years old have an ID card and have obtained the agent qualification certificate, you can become a salesman by attending the insurance company's new training class. If attendance cannot be guaranteed, you can take a part-time job. Part-time job is the same as full-time marketing staff except that there is no guarantee such as five insurances and one gold. You only need to attend the morning meeting/party once a week.

You don't need any education to do insurance, as long as you can read.