How do you sing well??

I want to know how you sing that makes it good. is it pronunciation, breathing, vowels, tone, pitch and if so how do you makes them all sound good?

I'll second what AgonyAuntie just said but would also add that singing accurately on pitch and in key is essential. If you're flat or off-key, it won't matter how good your breath control is — you're still going to sound like crap.