Formal:
* Très bien: This is the most common and literal translation, meaning "very well".
* Excellent: This is a more formal and emphatic way to say "excellent".
Informal:
* Super: This is a common and informal way to say "super" or "great".
* Génial: This is another informal way to say "awesome" or "brilliant".
* Top: This is a slang term for "amazing" or "fantastic".
More specific:
* Très bon: This means "very good" and is used specifically for food or things you enjoy.
* Fantastique: This is a more dramatic way to say "fantastic" or "wonderful".
The best choice depends on the situation and your desired level of formality.