Caitlyn is mix of attack speed/crit champion which deals huge amount of dmg in a short amount of time. If you want to dominate the whole game matchup you need to farm the entire game and build attack speed/crit items. Phantom dancer and Hurricane are best combo for her. When its a team fight try to stay out because she is weak when some1 jump one her. But her biggest attack range in game helps her killing enemys from distance, keep that on mind :D