Help me understand Flirting?

It's a complete other language to me. Like I know when other people are doing it to eachother because they make it sooo obvious. I cannot for the life of me "flirt" with someone and I know i'm screwed because thats how you show interest but seriously WTF is it really?! Flirting to me is like bold confidence (that I dont have) or annoying the guy and laughing at EVERYTHING he says (which is just, no). Is there a way to show interest without flirting? How do you REALLY know when someone is flirting with you? This is compacted question because i'm genuinely confused.
Help me understand Flirting?
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