Show confidence in who you are, and that you have many good things to offer others.  Avoid being overly confident by being kind and appreciative of others.  Avoid bragging about yourself, or making the conversation all about you when talking to a girl. For example, let's say you just met a girl, and she asks about what work you do.  Maybe you want to brag about how much money you make.  While this may seem like a good way to impress a girl, it's important to be humble, and instead focus more on what you enjoy about your work. Avoid being hard or down about yourself.  Try to focus the conversation on things that you enjoy doing, rather than what makes you annoyed or unhappy.  Avoid making the conversations intense or morbid. Show that you can be friendly and kind to others, not just to the girl you’re talking to.  Learn to be more comfortable around acquaintances or people you don’t know by asking questions about their interests. Avoid making her feel dumb, uninteresting, or rude.  Be thoughtful in what you say and how you say it.  If you think that what you say may come out wrong, or seem hurtful, avoid blurting it out.  Think before you speak.  Take a few seconds to process what you’ll say.  Imagine whether your words could come off as rude, cold, or unfeeling if you were in the girl’s shoes. Remember that each person is different.  One girl may react in one way, and another girl might react differently.  Be prepared for the possibility that what you say may not work out as well as you thought. Be supportive when someone is feeling down, frustrated, or confused.  Showing empathy and concern is a step towards a better relationship.  Offer your help in some way.  For example, if she’s had a bad day and she’s carrying lots of stuff, offer to help with carrying some of the items. Avoid trying to quickly find solutions to her problems. She may just want to have emotional support, rather than advice on what to do. Offer hugs to help console her.  If she’s very sad or tearful, be welcoming, but make sure that it’s appropriate.  Ask for her permission, such as, “I’m sorry about what you’re going through.  Do you need a hug?” Treat her as you would like to be treated—with kindness and sincerity.

Summary:
Be confident but humble. Be considerate of her feelings. Show your support when she's having a tough time.