Summarize this article in one sentence.
A smart girl won’t put up with a person who is disrespectful or mean to her or to others. Always speak kindly to and about others and be chivalrous and well-mannered.  If you go out to eat with her, make sure to speak to the server politely.  Hold the door open for her and for others. A smart girl very well may have a packed schedule. She’s probably very dedicated to school or her profession, and she most likely won’t be available every second of every day. Be patient and willing to change plans when things come up. This will show her that you are flexible and can handle adjusting to her schedule. Don’t be intimidated by all of the books she’s read or how many languages she speaks. You may feel especially compelled to show off and prove that you’re as smart as her by lying and saying that you’ve done what she’s done. This will only drive her away once she realizes that you’re lying. Instead, open up to her about the things that you do know a lot about. Try telling her about the activities, films, or books that you’re passionate about. Smart girls love a confident attitude. However, they can quickly tell the difference between confidence and arrogance. Have pride in who you are, but don’t be obnoxious and showy about it. Often those who are cocky and not confident try to “one up” others by constantly trying to prove that they’re better in one way or another. This will not impress a smart girl.

Summary:
Show kindness to everyone. Work around her schedule. Be honest about what you know. Be confident, not cocky.