1) Met this girl in the library. Went on a date and arranged for second date but she called sick and ghosted me. Did miss signs where she wants short-term intimacy eg. a hookup? Should I always try kiss on a first date? I noticed when we were holding hands (which i initiated) she didnt grip/close her fingers. Is this an indicator that she wasn't ready/interested in doing so?

2) Met another girl from my class. We went out together and it was very nice, but on our second date I confessed to her and she said she had a boyfriend, and that he cheated on her but gave him another chance. She even told me: Even if she's single she only considers me as a friend. She said I didn't show any signs that i like her on our first date.
Question is: I know I'm doing something wrong. How am I not showing enough interest? Even if she isn't looking for long-term then hookups are fine by me but how do I actually ask for one? Of course I prefer a relationship. Please teach me the art of dating.