Farm is important with Cait. If she gets killed in the early a many times its very bad because Cait have problems vs enemys with high damage like Teemo in the late with his Q. Thats why you have allways to outfarm yur enemy, poke him and try to kill him in the early but do it safe.

The spells are thery important with Cait. The Q is perfect to poke or Farm minions but it takes much mana so dont use it to much. The W are Traps wich you can plant and then enemy Champs go in there you can headshot them so its important to always have plantet some Traps to make many Headshots and Damage. The E is a net wich you can use to escape, stun, going over walls, and Headshots. Then you get ganked use the E on the Jungler or someone who can stun you or is near you and run and plant traps. The Ultimate is a Shot wich makes high damage but can be blocked by other enemy Champs . You can use it then enemy escape from you and are low wich will be many times they do this.

Team Work is important. If your Team sucks you suck to. Have a support Like Blitzcrank or Thresh wich can hook enemys and bring it to you. A Tahm kench or Bard are thery good to but donttake Janna because she sucks.