The amount of coverage required by law varies from state to state. If you’re a cautious person, you might opt for a more expensive policy with better coverage. If you have a lot of assets, experts recommend that you get enough liability coverage to protect them; otherwise, the other party involved in an accident could sue and attempt to collect on those assets.
The main difference between collision and comprehensive coverage comes down to the question of what the driver controls. Collision insurance will cover events within a motorist's control or when another vehicle collides with your car. Comprehensive coverage generally falls under "acts of God or nature," or things that are typically out of your control when driving. These can include events such as a spooked deer, a heavy hailstorm, or a carjacking.
Comprehensive car insurance covers damages from an "act of God," or events that are not caused by a car driving into something else. An "act of God" can include things like damage from a heavy tree branch falling on your car. Since you have no control over when or why a tree branch would fall on your car, this kind of accident would be covered under your comprehensive policy.
There are many factors that go into determining your car insurance rates. Some, like your age and gender, are out of your control. Others, like where you live and your marital status, are somewhat in your control. Finally, there are several factors that affect your auto insurance rates, like the insurance company you choose to work with, your driving record, your credit score, the kind of car you drive, and the amount of coverage you choose, that are completely within your control.