Hi im Rainbow Dash i love my little ponies but i love league of legends too.
Im a Yasuo main and this is my guide for yasuo. Im playing yasuo for over 3 years and nows the time for a guide. Follow these guide will make your brain hard enough

Precision - Best choice for assasins
Conqeuror - Best Damage Rune
Over Heal - Best choice for shield
Legend Blood Line - Yasuo needs more life steal and this rune sure helps him
Last Stand - I know yasuo is strong but if an enemy counters yasuo this is the rune you need to pick

Domination - Best burst of damage rune
Sudden Impact - Makes yasuo's third ability deal more magic damage and damage
Relentless Hunter - Out of combat rune good for clash.

Dorans Blade - Lifesteal and Damage great for starting
Phantom Dancer & Infinity Edge - partners in crime
Bersekers boots - Great for attack speed
Ninja Tabi - Armored boots great for vs Tanks
Mercury Threads - Magic resistance great for VS AP
Blade of the Ruined King - Cause Yasuo has attack speed so he needs more attack speed and lifesteal. A Yasuo without lifesteal is meaning less.
Bloodthriser - Needs more lifesteal to be powerful this item is what you need
Randuin - Great Passive and tons of armor and health
Steraks Cage - Cause Yasuo is so weak that he needs to be upgraded
Trinity Force - after using an ability yasuo will deal more damage than the first one
Frozen Mallet - Cause has a lot of health also partners with Triniy force
Guardian Angel - when you dead you live
Ghostblade - Movementspeed out of combat item and also lethality damage

Flash - Teleports to a short distance
Ignite - Giving enemy burst of damage
Teleport - Teleports to Turret Minion or Ward
Barrier - Gives shield
Exhaust - Slowing Enemies Movement Speed

The following spells are worthy for yasuo

Pros

- Yasuo is a cancer
- Yasuo's first ability has low cooldown and strong
- Windwall is unstoppable for ranged enemies
- Last Breath makes yasuo deal more damage
- Yasuo is the best champion
- Doubles critical chance
- Passive is strong

Cons

- Windwall is useless for non ranged enemy
- Yasuo is easier to kill
- Thats all

Dont murder your team or youll get ban