Lol, my first flirting 101 class came from a girl who was in a psychiatric hospital with me, who was convinced that flirting consisted of draping your arms around a guy of your choice and then making out!

No wonder I was screwed!
Funnily enough, I have observed that if nothing else, the funnest, most common flirting involves teasing, generally with some physical contact. With one of my boyfriends, we sat in a car together 'fake punching' each other for about five minutes and the punches got slower and softer and eventually we just didn't pull away and then we started holding hands and then... aww it was so cute! Oh yeah, and
for some reason, teasing the hell out of them is quite common!