Do I need to buy additional insurance for the rental car?
Comprehensive and liability insurance are included in the rental price. If you rent a car in Denmark, there is a deductible of DKK 5,000 per damage, which you can reduce to as little as DKK 0 by purchasing additional insurance.
You can also purchase extra insurance that covers, for example, personal injury. You can read more about each insurance option where you select them.