It would cover you under your Buildings insurance
Homeowners insurance does not cover automobiles nor there parts.
Your homeowners insurance will cover your garage door subject to your deductible since it is part of your house. Your Home insurance does not cover damage to a vehicle though. That's what Auto insurance is for. Your friend will need to contact his auto insurance to fix his vehicle.
If the items are scheduled on your homeowners insurance policy for coverage, the items belong to you and the garage is the same one at the insured home, then you should have no problem with coverage.
Most homeowners policies will provide coverage
No,, That would be covered under your auto insurance policy. Homeowners insurance does not cover damages to street vehicles.
No, You'll have to seek coverage for the Car under you Auto Insurance Policy. Now if the garage door was damaged then your Homeowners policy may fix it if it is below your deductible.
No. Vehicles are covered under an Auto Insurance Policy, Not a Home Insurance Policy.
Your homeowners insurance should cover damage to your sprinkler system if the cause of the damage is covered by your homeowners insurance policy such as fire, lightning, freezing of pipes, etc. Homeowners insurance is not a maintenance policy and will not cover mechanical failure of your system.
No, homeowners does not cover erosion. Erosion is considered normal and expected over time. It's not a sudden loss. It is also generally avoidable with proper maintenance.
If you have wind and hail coverage on your policy and the detached garage is a covered structure on that policy then Yes, your policy would cover the damages.
Yes, most of the time. Barring an exclusion to the contrary in your policy.