General "good":
* Da (pronounced "dah") - This is the most common and versatile way to say "good".
* Dda (pronounced "dda") - This is a more formal version of "da".
"Good" as in "good morning":
* Bore da (pronounced "bor-eh dah") - Good morning
* Prynhawn da (pronounced "prun-hawn dah") - Good afternoon
* Nos da (pronounced "nos dah") - Good evening
"Good" as in "well done":
* Da iawn (pronounced "dah ee-awn") - Very good, well done
"Good" as in "tasty":
* Blasus (pronounced "blah-soos") - Delicious
You can also use the word "braf" (pronounced "brahv"), which is a borrowed word from English meaning "good" or "nice".
Remember that Welsh is a language with a lot of variation depending on the region, so you might hear other ways to say "good" as well!