While all car insurance companies offer a similar product, they differ in how they deliver it. Some car insurance companies are basically self-service, allowing you to shop for and choose a policy completely online. Others use local agents who can meet with you and talk you through the process of buying a policy and personally handle any claims you have. Some companies use a mix of the two. Make sure you find a company that has the type of service you want.
Auto insurance is financial protection, and not just for the investment you made when you bought your car. After a really serious accident, bills for damage and injuries can easily reach into hundreds of thousands of dollars. If you happen to cause such a wreck, the victims could sue you. In the worst case scenario, assets such as your savings and home could be seized.