Hi everyone :) This is my first guide on irelia. I hope you like this guide. Sorry for Language. Because my english is low :)
And never forget those:
-You are Queen Of Solo Top and also Queen of LateGame. If you suck in early, just farm and wait for late game. [(I was 1/8 on ranked in early; In LateGame announcer called me Legandary. Final Score was:17/10. It means, if you suck in early game, it really doesnt matter. Just be sure enemies dont buy stack items(mejai,etc)]
-You can kill everyone in Late-Midgame** [**:not early, and on 1vs1 maybe 1vs2]
-You can steal Baron/Dragon with w+q combo[akways you can, early-mid-late]
-Red Buff always makes you Murderer. So pick red buff whenever you can.

Flash + X
X:Ghost,Exhaust,Ignite,Teleport

Marks: Greater Mark of Desolation
Quintessences: Greater Quintessence of Desolation
Glyphs: Greater Glyph of Warding / +MRPerLevel
Seals: Greater Seal of Resilience

I usually go mercury/banshee/trinity/atma's/warmog's/recurvebow combine(madred/stark's/etc)

But if i farm very well and gain 5k before 20min, i buy BF Sword combine(Thirster, etc.)

Ooops, forgot something : Your main items are: Mercury+Trinity. Always buy them. You dont need Berserker Graves, because Mercury is much better for irelia. You have %75 CC reduction in all teamfights with Mercury. It means, they cant stop you with stun/silence/slow(not supressed like ww/malz/urgot ultimate).

-Always do the last hit
-Spamm your "Q" for last hitting.
-Never miss your "Q" on last hit.
-Q is never on CD.
-Q is never on CD.
-Q is never on CD.

On 1v2:
-Wait at back, use your q for farming.
-After last hit, go behind caster minions.
-When you are on low mana go base and buy some items.
-If they try to turret dive, dont run. Just use e. And try to kill one(maybe two) of them.
-When your jungler comes for gang, dive them with your jungler(The best jungler mate is udyr). And pick up the double kill.
-Spam your ultimate for farm/for heal yourself/for kill.

On 1v1:
-Spam your q for last hit.
-Start harassing when you are level 4.(w-q-e-aa)
-If enemy has %50hp and u have more than him, dive and pick up the kill.

Good Jugnlemates:
-Udyr* (Jungle) : Stun, Tank turret when you do turret diving for kill them
-Nocturne (Jungle) : Fear, High Movement Speed, Awesome ulti for gang
-Warwick (Jungle): Nice ultimate
Good Lanemates:
-GP (Lane) : He can spamm q for harass; and when he press e, you can dive and pick up the kill.
-Malzahar (Lane): Awesome ultimate, You can kill 1 of them when malz uses ultimate.
-Jarvan IV (Lane): Ultimate, Knockout.
-XinZhao* (Lane): Xin e,q,w+Irelia w,q,e = You have slain an enemy or Xin kill enemy ;)

*:Best Lane/Jungle-Mates

Lanenemies:

Akali: Anti-Irelia
-If she wastes his w(it means, this skills on cd and far away from you and her), harass him.
-If she uses w when she is on low health; spamm r and pick up to kill.
-If she uses w when she is not on low health, wait at back. Because if you go in, You die. Flash cant save your *** this time.
-If you want to kill her, use step 1 & 2. Or wait your jungler

LeeSin/Garen:
-Dont dive, just do last hit. when you are at your turret, harass them. You can kill LeeSin when your jungler come or Garen go B.
-Always dodge LeeSin's Q.
-Use flash when you "REALLY" need to run with flash. Just Don't Waste It.

Corki:
-Just farm until level 6-7
-Try to kill him when you are 6-7. If he uses w and has %30+ HP, dont chase. If he uses w with low health , use flash+w+q . "You have slain an enemy"
-You can kill him easily when: He doesnt have w and flash. If he is on low mana, try to kill him. If he uses flash, you use flash too. And pick up the kill.


Ask me another champion, and wait for my answer :)

First Back Goals:
Philosopher's Stone, Boots of Speed, Wardx1, 2xHealthPotion

Second Back Goals::
Mercury's Treads, Sheen, Phage, Wardx1

Third Back Goals:
Trinity,Banshee, Wardx1



Full Items:
Mercury,Trinity + Situtational(Stt)

Stt1/Tanky Assasin:Banshee,Warmog,Atma's,Stark's (For ranked)
Stt2/Full AD-AS:Hexdrinker,InfinityEdge,Witt's End,BloodThirster (If there is noob enemy)
Stt3/Tank Hunter: GhostBlade/BlackCleaver/Madred's/Bloodthister (You can kill tank in 3-4 sec)

-Spam your ulti, dont save it for ks.
-Necer focus tank.
-Focus "Low Health Killer"(ashe,corki,cait,mf), and kill her/him.
-Always use w & r when you start teamfights.
-Use q for lasthit or dive one of runners*.
*If there is runner with low health: Use w,q,e,aa and grab the kill(You can use flash if you really need it to catch runner)
-Save q for last hit enemy, or catch them. If you can auto atack to enemy, dont use q to him/her. Example: If Tryndamere tries to kill you, just press w+e and kill him. if he runs away from you for save him ***, just use q and write /all :).

I will add video when i find a good record program. Tell me my mistakes and make me better ;)

Thanks for reading my guide :)