Yasuo, the Unforgiven
Yasuo is a champion who primary lane is mid and secondary lane is top.
He has 5 abilities with his passive.
His abilities are:
Passive: Way of the Wanderer 
Yasuo's Critical Strike Chance is doubled. Additionally, Yasuo builds toward a shield whenever he is moving. The shield triggers when he takes damage from a champion or monster.
Q: Steel Tempest 
-Cost: No Cost
-Range: 475
A skillshot basic attack. After two successful Steel Tempests, the next fires a tornado that knocks enemies Airborne.
Thrusts forward, dealing 20/40/60/80/100 (+100% Attack Damage) physical damage.On hit, Steel Tempest grants a stack of Gathering Storm for 10 seconds. At 2 stacks, Steel Tempest fires a whirlwind that knocks Airborne.
Steel Tempest is treated as a basic attack: It can critically strike, applies on-hit effects, is interruptible by crowd control and its cooldown and cast time are reduced by Attack Speed.If cast while dashing, Steel Tempest will strike as a circle.
W: Wind Wall 
-Cost: No Cost
-Range: 400
Creates a moving wall that blocks enemy projectiles.
Creates a moving wall that blocks all enemy projectiles for 4 seconds.
E: Sweeping Blade 
-Cost: No Cost
-Range: 475
Dashes through a unit, dealing escalating Magic Damage with each cast.
Dashes through target enemy, dealing 70/90/110/130/150 (+60% Ability Power) Magic Damage. Each cast increases your next dash's base Damage by 25%, up to 50%.Cannot be re-cast on the same enemy for 10/9/8/7/6 seconds.If cast while dashing, Steel Tempest will strike as a circle.
R: Last Breath 
-Cost: No Cost
-Range: 1200
Moves to a unit and strikes them repeatedly for heavy damage. Can only be cast on Airborne targets.
Blinks to an Airborne enemy champion, dealing 200/300/400 (+150% bonus Attack Damage)physical damage and holding all Airborne enemies in the area in the air for an additional 1 second. Grants maximum Flow but resets all stacks of Gathering Storm.For 15 seconds, Yasuo's critical strikes gain 50% Bonus Armor Penetration - this affects Armor from items, buffs, runes and masteries.
The information is taken from the official league of legends site.
or http://gameinfo.na.leagueoflegends.com/en/game-info/champions/yasuo/
He is really good in early and late game he is very strong if you can get feeded and you can get phantom dancer or static shiv and infinity edge.
I recommend you to build Phantom Dancer or Static Shiv after that Infinity Edge and Bloodthister and Ravenous Hydra and then maybe Mercurial Scimitar and a Elixir of Wrath-(you need level 9).
I really like playing yasuo because i think you need to have skill to play the champ not like annie or cait that they have no mechanics and a re so easy to play.I main him and i really have fun when im playing him.I don't recommend you to play him if you don't know what your doing.