How to learn to flirt for fun and get good at flirting?

I have no luck with men and always end up the one played. A friend told me the key was to flirt for fun so you don’t get attached unless the feeling is mutual and they fall first. I don’t know how to flirt at all, my go to is to act like I don’t even notice the person I’m interested in so they can’t reject me until they already like me. Obviously, this is pretty effective. How do I flirt like a normal person? (preferably not to direct considering I’m in high school and I don’t wanna be made fun of)

How to learn to flirt for fun and get good at flirting?
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