It depends on the type of girl. Some girls like guys who are attentive, respectful, loving/caring, sensitive, etc. and some girls like guys who are bad*****.... who like to fight or is rude to people and are aggressive. The real question is " What is their type ? "
In a guy girls look for someone who is confident and doesn't say negative things about themselves. one of my personal biggest pet peeves is when guys call them selves fat....when they weigh less than the girl that they're talking to. Anyway, if there's a girl you like, then think of things you would say if you had a conversation with her because if you're easy to talk to then she'll eventually like you :) hope this helps