How to get more information about insurance in all fields and be professional salesman to sell this product / coverage / service ?

In most of countries - Insurance is mandatory and almost cover all the fields

by gaining knowledge about yours Scheme and customer requirement you can be a successful salesperson.

to know more about the products - each insurance company giving perfect training before you start your career .

To know more about types of insurance please see https://en.wikipedia.org/wiki/Category:Types_of_insurance

There are training courses for each type of insurance.