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Hey, this is Visio. This is my first guide on MobaFire. I enjoy playing Caitlyn, and I hope you will enjoy playing her using my guide. I have put a lot of work into this guide so please up-vote if you like it, and please comment on what you don't like before you down-vote.

Here is some music to listen to while you're reading my guide. It's pretty awesome:

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Here is Caitlyn's Champion Spotlight: Play Video

Great Summoner Spells

Flash

Some people would debate that Ghost is a better escape mechanic than Flash, and on some champions it is. But for Caitlynflash is an excellent choice for a summoner spell. If you are being chased use it to go through a wall. If you are chasing someone flash to them and kill them with Piltover Peacemaker.
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Ignite

Ignite is useful against champions like Dr. Mundo that have healing spells because it reduces the amount of healing the enemy does. It also does quite a bit of true damage so it can be used to secure kills when you don't have Ace in the Hole, or just to turn the tide on a 1v1 battle.
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Ghost

Ghost is another good summoner spell. It can be used to escape from or chase enemies down. I would use this if I was a newer Caitlyn player. If I am experienced I would use flash. Ghost is better for champions like Singed because of his Poison Trail
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Exhaust

Exhaust is another viable summoner spell, but I don't use it very much. I can never find a time when someone is running from me and I am close enough to use exhaust on them. I would recommend this for newer Caitlyn players.
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Okay Summoner Spells

Heal

Heal is an okay summoner spell. This spell is used to heal and stay in your lane or heal during a battle. I think the cooldown on the spell is too long for it to be a good lane-sustain spell so I wouldn't use it. If you find yourself running out of health a lot you should use this, though.
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Surge

Surge is another okay summoner spell. This spell can be used to increase your attack speed, which can be useful in 1v1ing an enemy champion or taking down a turret. I do not recommend this spell though.
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Cleanse

This spell should not be used often. It should only be used if you know that the enemy team has several CCing champions or champions with poison.
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Never Use These

Marks

Desolation
Greater Mark of Armor Penetration
I buy Greater marks of Desolation because armor penetration is important on Caitlyn. I have seen lots of tanks that stack armor recently, and Caitlyn can easily counter these tanks with enough armor penetration.
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Strength

If you insist on having as much attack power as possible then I would get this, but I would recommend you try Marks of Desolation first.
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Malice

I would use Greater Marks of Malice if you enjoy critical hitting enemy champions. This will raise Caitlyn's critical strike chance noticeably.
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Seals

Resilience

These runes give armor which is a valuable thing to have on Caitlyn. We all know she can be kind of squishy and this will help her stay alive early game. Buy these for the armor.
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Replenishment

I buy Seals of Replenishment because of their mana regen. boost.Without these, during early game I always seem to run out of mana,but once I bought these my mana is always there for me. Now, these runes are a must to me.
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Glyphs

Warding

Caitlyn is a generally squishy champion and could use some defense from casters. These glyphs are the perfect thing.
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Clarity

These are good runes for their mana regen. After buying the Seals of Replenishment, if you are still having mana problems you should buy these.
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Quintessence

Strength

These runes will raise Caitlyn's attack damage noticeably and this scales Caitlyn's Piltover Peacemaker up quite well.
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Desolation
Greater Quintessence of Armor Penetration
Again, Caitlyn gets armor penetration so she can shred through armor-wearing tanks, and believe me this gives her HUGE boost.

Headshot(Passive)

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This is one of the best passives in the game and it synergises with Caitlyn so well that it is my favorite passive. This passive should make farming and champion killing easier.

Tips:

• Remember Headshot stacks twice as fast if you are shooting from within brush
• Try to hit enemy champions when Headshot is ative. It is a good harass.

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Piltover Peacemaker

This ability is you only harass through the entire game. I find it one of the better harasses because it has good range, does good damage, and goes through enemies. This is a skill shot though so aim well. You will want to get this at level 2 and max it out first.

Tips:

• Do not use this too often. It will drain your mana.
• Do not shoot through minions to hit a champion. The more enemies this ability goes through the less damage it does.
• Do not use this to farm minions early game.
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  Yordle Snap Trap

  
  
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  These traps are good for stunning and revealing champions. These traps can do anything from preventing ganks to stopping enemy turret divers. These traps do a little magic damage and I have gotten kills with them. You will want to get this ability at level 1 and max it out last.
  
  Tips:
  • When you enter the lane Place you traps across the lane like this:
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  • You can also place your traps:
    In the Jungle bush near the lane
    and in your and the enemy's middle bushes
  • These traps make people visible for nine seconds so you will be able to see them in bushes.
  • If you are in fear of being turret dove, Follow this chart:
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  Chart Explanation-
  If you lure them behind the turret they will have to risk stepping on a trap or going upward, which will get them hit by the turret 2-3 more times.
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  90 Caliber Net

  
  
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  This is your best escape mechanic. This ability shoots you backward and slows the first enemy it hits. This does small magic damage and I have stolen kills with this ability. You want to get this ability at level 4 and max it out second.
  
  Tips:
  

  • You can jump through some walls with this ability.
  • Chasing Someone? Shoot the net backward. You will gain ground.
  • If you need to harass, but the enemy team does too much damage to get close, run in and use Piltover Peacemaker then immediately use 90 Caliber Net to shoot yourself out of there. If the Piltover Peacemaker and 90 Caliber Net hit the enemy the will lose alot of health.
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    Ace in the Hole

    
    
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    This ultimate is pretty awesome. Once you lock on this ultimate is global, but the enemy has to be in range to lock on. At level 18 with my full build the ability should do around 1000 health to a champion with no armor. Upgrade this ability whenever possible.
    
    Tips:
    
    • Your range extends outside your fog of war so if an enemy steps right out side your fog of war when you need to use Ace in the Hole on them have your support cast Clairvoyance so you can lock on.
    • Enemies other than the target can intercept this ability so it's not so great in a team fight.
    • Do not wait for the perfect chance to use this. This ability can be used to damage in a 1v1 fight as well, and it's cooldown is kind of short.

Beginning Items

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Boots

Berserker's Greaves

These are the normal boots you would get, because attack speed works along with Caitlyn.
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Other Boots

You can switch The Berserker's Greaves for any of these if the situation is just right.
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Basic Items

B.F. Sword

This will be your main damage exporter early game. Buy this right after you get the your boots. This should make farming a bit easier.
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Zeal

This item will add a little attack speed to the mix, making last-shoting minions so much easier. Buy this right after the B.F. Sword.
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Vampiric Scepter

Now this will add a little survivability. As you kill minions and champions you will slowly heal back up
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Advenced Items

Infinity Edge

This item gives a large amount of damage. You should notice yourself majorly out-DPSing other champions.
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Phantom Dancer

This item should make your attack speed raise along with your movement speed and you critical strike chance.
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Bloodthirster

Caitlyn should regain health quickly now while she is attacking minions and champions.

Damage

Last Whisper

The Last Whisper gives damage as well as armor penetration so it is an ideal optional item for Caitlyn.
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Black Cleaver

This item gives attack damage armor penetration and attack speed, so get this if Caitlyn feels slow to you.
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Maw of Malmortius

This gives Magic resistance along with damage so If the team has a lot of AP characters buy this item.
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Wriggle's Lantern

Along with attack damage this item gives armor. Buy this item if the enemy team has many AD carries.
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Frozen Mallet

Frozen mallet gives Attack Damage and health. If the enemy team is killing you often and they do mixed damage I would buy this item.
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Supports

When the game begins buy your starting items and head to bottom lane with your support. Caitlyn is good with a large range of supports, but some of her best are:
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Soraka:
Soraka is your average support; she has two heals, and one small harass, but what makes her stand out from all the rest is her ablility, Infuse. Since Caitlyn's abilities have a high mana cost and can be used often, this is the perfect ability for Caitlyn.
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Blitzcrank:
Blitzcrank's Rocket Grab is pretty amazing and I might goes as far as saying op. Blitzcrank can grab the enemy pull them toward Caitlyn and she can take them down. Power Fist is also another good ability to keep them in place while Caitlyn uses Piltover Peacemaker.
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Taric:
Any Chamipion with a stun or a snare is good with Caitlyn. Dazzle is a stun that works well with Caitlyn. Once an enemy champion is stunned Caitlyn can hit them with Piltover Peacemaker, Headshot, and basic attacks.
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Morgana:
Morgana is another champion with a snare. Her snare, Dark Binding may be a skill shot, but it can snare the enemy for up to 3 seconds allowing Caitlyn to use Piltover Peacemaker and basic attack on them.
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Lux:
Lux, like Taric and Morgana has a great CC ability. Her snare, Light Binding is almost exactly the same as Morgana's Dark Binding, except Light Binding hit two targets and slows for 2 seconds.
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Laning

Now that you are in you lane with your support, aware of your counters, and ready to go it is time to learn a little bit about zoning and farming.
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Here is a video that explains zoning quite well. Give it a watch. Play Video
Zoning is basically controlling land. It is your job as well as your support's to harass so that you control more land. Harassing is hitting enemy champions from a distance so you take no damage. Caitlyn's only harass is Piltover Peacemaker. Along with help from you support you should be able to dominate the lane with this ability. Keeping enemies back from the point where they are gaining experience is what you are trying to do. You will always want to control as much space as possible.

Once you have mastered zoning the next thing you need to look at is farming. Farming is all about last-hitting. If you last hit a minion you will gain extra gold allowing you to buy items faster. Once the enemy is away you should be able to last hit easily. It is not your support's job to last hit minions. Your passive, Headshot, works great with farming. The more damage you deal the more likely you are to last-hit.
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Team Fights

First of all what is a team-fight. The name team-fight should be self-explanatory. A team fight is a battle between many members of both teams. These most often occur around late game.
You might be asking "As Caitlyn what is my role in a team-fight?" Late game Caitlyn should have high Attack Damage making her basic attacks very important to team-fights. Also since her Piltover Peacemaker passes through enemies it is a usefull ability. Using Ace in the Hole in a team to secure a kill is not always going to work. The bullet can be intercepted by other enemies. It would use Ace in the Hole to lower someone's healthe nearby.
Another thing, as I have stated before Caitlyn is not tanky so let your team's tanks handle all the damage taking. You should be the major damage output for your team and they need you to live long.

Thank You for reading my Caitlyn guide. I hope you have learned some thing useful from it. Please up-vote this guide if you learned from or enjoyed any part of it, and please comment before you down-vote. Feel free to leave questions in the comments I will try to answer them as soon as I can.