Answer:
Well there's 3 ways you can look at this. You could be a girl talking to friend that's a girl, a guy talking to a friend thats a girl, or mostly a guy talking to a girl that he likes.
Girl and girl friend - Well this is pretty simple, don't one of those annoying friends that only talks about herself and goes on and on about herself or this guy that she likes, especially if the friend your trying not to annoying likes that guy. Also if you've talked for most of the convorsation, how about listening to what she has to say.
Guy and girl that's a friend - Look if your one of those guys who has a girl for a friend, great for you. But if your a good friend you should know some stuff about her. So talk about some things she likes, and if she likes animals dont talk about how great it is that Mexico makes horse meat and that China likes to secretly use cats in the menu. If your a new friend just ask questions but dont be creeper and become stalker material. And dont be too full of yourself. No girl likes it when you just talk about the abbs you dont have, or do have.
Guy and the girl that he really likes - First if you know that she likes you too, and she isnt with someone else or is and is about break up with him, do the simple thing, ASK HER OUT. She isn't annoyed by you if she likes you. But if you dont know 1. Try and find out 2. talk about what she likes and stay calm, don't shudder, and just dont say annoying things. Plus if you do like but her, you don't know if she likes you and she's not with stonger guy that can beat your face in, tell her that you like her, if she says 'ew', she's not for you.