Signs of a healthy argument:
You’ve taken the time beforehand to think about what your goal is (Are you trying to be right? Or are you trying to understand each other?)
You do your best to not hurt each other with your words, because you’re trying to understand each other.
You address your feelings without accusing each other (“I feel ___ when ___ happens”…. NOT “You never ____!”) because no one likes being accused. Even if it’s an accurate accusation.
You verbally remind each other that you’re arguing for the sake of understanding each other, and NOT just to be right/stir up some drama/take out frustration.
You both listen to each other’s points. Listen fully. Express your thoughts fully.
The argument finishes with you both feeling respected.
Ideally you come away with 1) a compromise/decision, 2) a better understanding of each other, 3) (ideally) more love and respect for each other.