Chess is more than just a game, it's an art. No matter how good you are at it, and no matter how many strategies, openings, endings and techniques you know in it, there is always something new you can try. It is all about planning, good observation, quick and calculated thought and predicting the opponent's moves. The game of chess is probably the only game where there is no such thing as luck.
To become a good chess player, you need understand yourself. Understanding how you make your decisions and how you go forth to achieve your goals.
If you are one of those people who take every step with caution, avoid taking risks and not ready to lose anything you have to gain something new, then play defensively. Playing defensive has its advantages especially if your opponent is someone who plays very aggressive. What you need to concentrate on is you pawn positioning. Play defensive and avoid exchanging pieces, keep blocking the opponent from breaking through and wait for a mistake or opening to go on the attack.
If you believe in taking risks without losing too much, then play aggressive by reinforcing all your pieces by one another. The key pieces for you in this kind of strategy are the knights. Position your bishops and queen to target an area on the board and then use your knights to create an opening for them. Use your pawns as distractions by attacking with them the area you do not plan to exploit. Most expert chess players use this strategy.
If you are an adventurous and aggressive personality, who lives dangerously and loves taking risks, then play exactly the way your personality is. Make an aggressive opening and try to reinforce the center of the board. Do not mind exchanging pieces but save your rooks and queen for the later game. This strategy of exchanging pieces mercilessly is called the 'Butcher method'. Force the opponent to move his king and then capitalize on it by attacking the area where his king is.
Learn the basics of chess to perfection then improve your game by playing more often and better players. See the famous games played by the grandmasters of chess and learn to think how they think. However, once you have become good enough by learning from others, then its time to get even better by making your own moves and strategies. Keep in mind, self belief and knowing who your opponent is, is the key to victory in chess.