If you ask your friends on how to get a girl to like you, the first thing they will tell you to do is flirt. So when you meet a girl you like, make sure that you make a brief eye contact with her and smile. If you are able to strike up a conversation with her, and then make sure you make it casual; as you do not want to scare her with your seriousness. So remember to relax when you are around her, as you being nervous will only make a bad impression. If you do not talk to girls and are generally shy around them, try to talk to other girls in order to be more confident around the other gender. You can even make jokes to flirt with her, so that she feels she can also be relaxed around you, without worrying about the little mistakes people make during conversations.