I’d be more worried about what you’re gonna do with the last 29 years of your life

I need an ELI5 for this I’m a stupid Gen Z

Okay, as someone who wants to live in Europe at some point in the future, I feel like I should get this straight.

If I drive by a car accident and there is clearly help on the scene, such as an ambulance, do I need to take any action?

If I drive by a car accident and there are a bunch of people already stopped, do I need to just ask one of them if help has been called?

If I drive by a car accident and no one is there, do I just need to call for help?

I know some first aid so I might stop regardless if there isn’t an ambulance there.