Informal:
* Hej: This is the most common and versatile way to say "hi." It's appropriate for friends, family, and casual acquaintances.
* Hallo: This is another common greeting, similar to "hello" in English. It's slightly more formal than "hej" but still informal overall.
Formal:
* Goddag: This is a more formal greeting, similar to "good day" in English. It's appropriate for strangers, people in positions of authority, and in more formal settings.
Other options:
* Godmorgen: This means "good morning" and is used in the morning.
* Godaften: This means "good evening" and is used in the evening.
It's generally safe to use "hej" in most situations, especially if you're not sure what level of formality is appropriate. Danes are generally friendly and forgiving of language mistakes, so don't be afraid to try!