How do I flirt?

I know your gonna say its sad a 23 year old guy doesn't know how to flirt but its true I don't. I was at gnc earlier picking up some supplement there was a cute girl working there she asked me if I needed any help I told her I was gonna text my friend cause he had recommended something anyways got up to the register told her that me and another dude was flexing at work and I got shown up and with a smile and laugh she goes so your really competitive I say yeah
How do I flirt?
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