What do "que paso" and "buenas dias" mean?
¿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.
this is a Mexican use of the "¿Qué hay? in Spain.
The past tense makes no difference, both mean: what's up?