Some car coverages apply universally because they're foundational coverages. It doesn't matter if your car is on its last legs or you just drove it off the lot – there are certain coverages you are required to have and some that are optional.
However, other coverages might vary depending on a few factors. If your car is damaged, will it cost you more to replace it, or get it fixed? Collision covers the cost to repair or replace your vehicle in the event of a collision (with another driver, a tree, a pot hole, rolling over). Comprehensive covers events beyond your control (like a tree branch falling on your parked car, or Godzilla smashing your car on his walk back into the sea). Transportation Expenses may cover the cost of renting a car following damage. Some factors that determine which coverages apply to specific cars are the value of your car, your risk of an accident, your current savings/ability to pay out of pocket, and where you live. These are all personal factors for you to consider in selecting which physical damages coverages you want or need.
If your car is fresh out of the dealership and you live in Godzilla's preferred stomping grounds, you may want Collision, Comprehensive, and Transportation Expenses. If you bought your car for $200 in 1998, you may want to skip Comprehensive and Collision.