If you like someone how do you show it?

If you like someone how do you show it? What's the usual signs you give? Hints? What do you do if the person doesn't notice your signs/hints? What do you do if your flirting with someone and their flirting, but neither one makes a move? Or you see that happen with a friend?
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This isn't about me lol. I'm just curious
If you like someone how do you show it?
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