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.
Additional living expenses, or loss-of-use coverage is typically a fixed amount – 20% of your dwelling coverage. However, if you live in an area prone to wildfires or hurricanes, it's worth checking with your insurer to see if they offer higher coverage limits in the event a catastrophe forces you from your home for an extended period. Additional living expenses can add up, so it may be worth the added peace of mind to increase this coverage component.
Collision and comprehensive insurance are two optional types of auto insurance where your insurer pays for repairs to your vehicle. While there are other optional auto insurance coverages, liability, comprehensive, and collision are three of the most common. These coverages work hand-in-hand to repair or replace most of the damages to your car. It's important to know the difference, and make sure you're adequately covered.