What do "que paso" and "buenas dias" mean?

Question

What do "que paso" and "buenas dias" mean, and are they pood or bad Spanish?

Answer 1

¿Qué pasó?=What happened? How have things been going with you?

¿Qué pasa? = What's up? How are things going with you?

Buenos días. Either Good morning or Good day.

The phrases are proper Spanish. You just need to correct the spelling and punctuation.

Answer 2

¿Qué pasó?

this is a Mexican use of the "¿Qué hay? in Spain.

The past tense makes no difference, both mean: what's up?