You mostly need to play a lot more, and spend time after the game figuring out what went wrong (ask your opponent for tips!)
But if you wish to study more...
Follow chess news -- here on chess.com, chessbase.com, chessvibes.com, chesscafe.com -- and read the articles. Play through the annotated games.
Download Scid (http://scid.sf.net), download this week's harvest of games played around the world at TWIC (http://www.chess.co.uk/twic/twic.html) and play through them very quickly at random.
The goal is to get a feel for what a normal game of chess looks like, what is a normal move and what isn't.
That, but again, the most important thing is figuring out what went wrong in the games you lose. If you're still dropping queens, or missing your opponent's mate in one threat, then you need to work on recognizing those before all else. Work on endgames when they're you're weakest point left.
I've been a member here for only a little while. I always play chess whenever my uncle or cousin visit, so I'd guess I play 20-30 games of chess a year, not including some chess games here on chess.com. I've been using an online chess tactics trainer where it presents you with a game situation and you have to make the best move possible. So my question is: How do I begin my chess education? I see everybody on forums writing about strategy, tactics, chess theory, openings and don't know where to start. I honestly don't know what my ranking is, but what website should I be reading? What books should I download and read? How do I get better in a systematic way?