By Jason McDonald One of the soundest investments that one can make - and Robert Jain and others in finance will agree - is auto insurance. Most people use cars, vans, and other such vehicles to get around, and while they are usually careful when behind the wheel, the margin for error always exists. Before you put the money down for this type of insurance, it's important to know what you're investing in. Here are the most important auto insurance questions to ask. "Do I require auto insurance by law?" For the most part, in the United States,...