Depends on the society. It can be quite involved, like with Japanese culture.
Most Western cultures it's easy. And unfortunately often taken for granted once after a couple of words. Like: "I'm sorry".
Then there are the rude people. Often they too young to know what manners are. And so they just walk away, ignore or outright block. And even the reasoning can vary. Like keeping it positive or they really just don't care.
Those are just three of the basic and common forms of etiquette . There are more and depend on the society.
I haven't touched on Arabic forms of apology, because I'm no longer familiar with it. Don't turn your back on them though! Even if they probably no longer throw a knife at it.
