* Da: This is the most common and general way to say "good".
* Dda: This is the formal and literary form of "da".
* Braf: This means "nice" or "pleasant" and is used to express approval.
* Hwyl fawr: This means "goodbye" and is used to say "good" in the sense of "have a good time".
Example:
* "That's good" - "Mae hynny'n dda"
* "Good morning" - "Bore da"
* "Good evening" - "Prynhawn da"
* "Good night" - "Nos da"
* "Have a good day" - "Cael diwrnod da"