What is teasing?

What is the signs that he's teasing? I know this might sound stupid but I'm not very good on picking up if a guy likes me or not. I've watched plenty of videos and read articles and a lot of them say that "if he teases you/makes fun of you he likes you" but what if that's just his personality? What's the difference between him being him and him teasing because he likes me?
What is teasing?
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