What are signs that a guy is checking you out?

I honestly can never tell. How would ik if I ever think a Guy is checking me out I will later tell myself it's all in my head like today the guy who renewed my library book didn't say anything but he was staring at me straight in the eyes and slowly licking his lips like I don't know it could have just all been in my head so how do ik for sure a guys checking me out? Even the little ways? And why do guys check me out and not approach me? How can I show them I'm also interested without saying anything
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What are signs that a guy is checking you out?
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