How do you know?

How do you know when you want to date someone? I've had crushes before, but they were usaully on guys I didn't know that well, and I've had guys as friends that I've thought were attractive and I'd like to get to know them better, but I've always been hesitant to take the next step. So how do you know when to date someone? How do you know that they  want to get to know you better as a person vs just want to date you for the sake of dating/ physical stuff? Experiences, advice, and stories are greatly appreciated ❤️.