By law, all agents selling or giving insurance advice must be licensed in the type of insurance they are selling or giving advice for. Each state has their own licensing requirements, but generally insurance agents can be licensed in property and casualty insurance and life and health insurance. Some agents hold two insurance licenses, in both property and casualty and life and health, and some only sell one type of insurance such as life and health therefore, only hold a life and health insurance license.
It is important to know how your agent obtained their insurance license, how long they have had it, and if they regularly get it renewed. Any legally licensed insurance agent would not have a problem giving you this information.
If you are interested in learning more about going to insurance school and taking insurance classes and insurance courses to obtain an insurance license, the easiest place to find more information is by searching for it online at your state insurance commissioner's website.