Add the difference between agent/company and broker/company.
Generally speaking, agents sell insurance policies from the standpoint of the insurance company they represent, and get commissions from the insurance company, while brokers choose insurance companies to buy insurance policies from the standpoint of customers who want to buy insurance, and generally get remuneration from customers, and some even get less commissions from insurance companies.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.