Any advice on how to cold approach a girl?

I need to improve my game on pick up and I think cold approaches is the quickest way to do it. I only hit on girls in a neutral environment before it feels more natural but when it comes to cold approaches I dont know what to say. it's not that I'm worried about rejection I just feel like after I say hi my mind will go blank. what the heck do you guys talk about with a complete stranger and do you have any openers?
Any suggestions where to pick up girls other then the bar or club and pls don't say just say hi. for the girls who been hit on what goes through your mind when approached by a complete stranger, do you find it flattering or do you get defensive?
Any advice on how to cold approach a girl?
Add Opinion