How can I tell if a girl likes me?

So I'm still in school but am close to leaving that stage behind and am thinking about getting a girlfriend, currently i dont have preferences but I can't tell if a girl likes me, if she does I'm all for it but how can I tell? (I know how to ask girls out it's just I haven't dated in a while and I might be desperate)
How can I tell if a girl likes me?
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