Listen their are too many skrubs on here asking for relationship advice, so I'm going to make this quick and simple. And it's mostly the guys. Girls aren't as pathetic. But my advice could be taken by both girl or guy.
1. Confidence. You never want to be to over confident, but than again, you don't want to be one of those shy otaku nerds who sit in the corner of the class on their 3ds playing Pokemon (too specific?). You want to be normal. Talk. Build conversations. That's the key to any relationship. Whether it be with a friend or lover.
2. Knowledge. Have a vast knowledge of the things around you. You don't want to be in that awkward situation where your having a conversation with someone, and a few minutes later, you ran out of things to say. So you slowly turn your head and pretend nothing happened (too specific again?). Anyways, girls like a guy who's smart. So hit those books and get studying.
3. Respect a girls personal space, but in some cases, it's fine not to. Play with her hair. Take her phone while she's texting. Some girls just really don't care. Do something she wouldn't want you or anyone to ever do. Be extreme. This will definitely build up the relationship.
Ex: Guy starts playing with girls hair. Tanya: Omg, Chris stop. Your so annoying!
^That my friends, means she's enjoying it. And she is liking you even more than before.
4. Listen! To! What! She! Says! A girl always likes a good listener.
5. Hygiene. No girl is one to talk to the smelly kid in class.
6. Focus on one person. If your trying to build a relationship with this girl, you don't want this her seeing you talking to another girl.
Thanks for reading, hope you skrubs learned a thing or two. Now got out their and knock those ankles loose!