What makes a good kisser?

Since my first relationship when I was 15, the girls I've dated/kissed have always said that I'm a good kisser. I don't understand why or how. It's not like I kissed anyone before I kissed someone for the first time. I just put my lips on theirs and voila, an apparent good kisser. It also acknowledges that there are bad kissers? Like, kissing is such a simple concept in my mind, I can't figure out how someone could be a good kisser vs a bad kisser 🤷‍♂️
What makes a good kisser?
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