Although interacting with girls seems like an intimidating endeavor to many guys, adhering to certain principles allows it to be a more comfortable and enjoyable experience for everyone involved.

Steps:

1.Be yourself.It's important to maintain self confidence by being yourself around girls. If you adopt an alternate personality to attract girls, you will eventually be weighed down with the feeling that your true self isn't good enough. It may help to develop and improve your social skills, but any girls that don't appreciate you for who you are don't deserve your attention.

2.Respect all girls equally.You stand a much better chance of making a good overall impression if you treat girls that don't interest you just as nicely as those that do. This doesn't mean that you need to talk to or flirt with every girl, but don't ignore them or treat them dismissively. Don't talk to a girl about other girls' attractiveness; it's distasteful and can degrade the girl's opinion of herself. You generally shouldn't talk about past relationships you've had, or other girls that interest you; it detracts from building a new relationship.

3.Make eye contact.Many girls like it when you can't take your eyes off them, but not when you're staring at their boobs. Although there are some girls that may enjoy such attention, you won't offend anyone by focusing on her face instead. Do not ogle her. Just remember to use discretion and show proper respect.

4.Make them feel special.Girls like it when you're forward but not in a creepy way. Smile at her in a way that's clear, friendly, and/or playful. If you feel compelled to honesty, you can offer a sincere compliment. For example, you could say "Did anyone ever tell you that you have a beautiful smile?" Eyes are another good one- they're not the easiest thing to notice, and it shows you were looking at her face. Select something good that is reserved for her only; it will make her feel wonderfully special, admired, and beautiful.

5.Be a gentleman.Girls love guys that are polite and courteous. It's just a matter of doing simple things like holding doors open for them and being respectful in other ways. Some claim chivalry is dead, but if you believe that, then you're going to have some problems getting a girl's interest.

6.Keep your manners in check.Watch the foul language. Don't pick your nose, scratch your butt, pick at your body in any way, fart, or burp, cough, or sneeze with your mouth wide open, etc. Gross her out, and you'll be lucky if she ever looks at you again.

7.Make her laugh.Being funny is one of the most attractive qualities a guy can have, and if you're not "handsome", a girl will usually overlook that! If you're not goofy but you have a very dry, sarcastic sense of humor, use that. Just watch your timing and try not to be too goofy, or you may make a fool of yourself. It's okay to tease her a little, but generally not about her appearance.

8.Noticewhen you're having a conversation and she seems uncomfortable, change the subject. Watch her movements, if she's shifting her weight a lot and not making eye contact, chances are she's uncomfortable.

9.Recognizethat physical contact should be limited by the state of your relationship.

*Acquaintances — A handshake when introducing yourself is probably a reasonable limit for a first meeting. You can also subtly brush your hand against her hand or arm.

*Casual Friends or Prospective Dates — You could try something like touching her hair or playfully poking her in the side and asking if she is ticklish. This is generally considered flirting, and if a girl doesn't appreciate your advances, it's best to apologize and refrain from making similar contact.

*Good Friends — It is generally acceptable to give friendly hugs to girls that you know fairly well, even if you aren't a couple. Just be sensitive to the girl's feelings about it; pressuring her to hug you will make her uncomfortable.

*Boyfriend/Girlfriend — When you've grown closer, you can hold her hand or wrap your arm around her shoulders or waist when you're walking together. With her consent, you can also kiss her.

Tips:
Be the same around her and your friends.
Never use the words "hot" or "sexy" unless it's in a joking fashion.
Don't ever tell her that she looks bad.
Don't try too hard. She'll notice.
Don't panic if you do something embarrassing. A lot of girls find that really cute.
Manners: use them! If you don't have them, then get them!

Warnings:
Do not make sexist jokes.
Don't focus too much on one girl if she isn't enjoying the extra attention. She may get annoyed, and it will likely hurt your relationship.
Never tell any of your friends what happens.
Get to know her friends and be friends with them. This will show her that you're nice and friendly.
There is nothing wrong with trying to make her feel special long into a relationship, but trying to kiss up to her, especially within the first few weeks and months of knowing her, will do more harm than good, and you will be labeled more as a friend who tries to buy her attention than a potential mate.