Why yasuo top? :
+ Good Mobility
+ Good farm
+ Easy to OTP
+ Strong Early game (lvl 1-2)- Mid game
+ High dmg on Towers (Easy Spilit Push)
+ High dmg and High Dps
+ Can block some abilities by his W
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Cons:
- Bad late-Early game (3-10 Mins)
- Bad teamfights
- Squishy
- Bad vs CC
- Have a lot of counters
- Hard to Master
- The wrong use of E can get him killed

Resolve: Moving grants flow, which is tracked on Yasuo's resource bar. Moving faster grants more flow. At maximum flow, damage from a champion or monster briefly grants 125-600 shield (depending on level).

Intent: Yasuo's critical strike chance is increased by 150%, but his critical strikes deal 10% reduced damage. Gain 0.4 bonus attack damage for every 1% critical strike chance above 100%

Yasuo thrusts, dealing 20 / 45 / 70 / 95 / 120 (+1.0 per attack damage) physical damage. If he hits, he gains a stack for 6 seconds. While he has 2 stacks, his next use of this ability fires a whirlwind from range, dealing the same damage and knocking up for 0.75 second. If used while dashing, this ability strikes in a circle rather than a stab

Yasuo creates a 320 / 390 / 460 / 530 / 600 wide drifting wall of wind that blocks all enemy projectiles for 4 seconds.

Cooldown: 25 / 23 / 21 / 19 / 17 / 15 seconds.

Yasuo dashes through a target, dealing 60 / 70 / 80 / 90 / 100 (+60% of ability power) (+0.2 per bonus attack damage) magic damage. Each use of this ability grants 15-25% bonus damage to the next use for 5 seconds, stacking up to 60-100%. If Steel Tempest is cast while dashing, it will strike as a circle. This ability can only be cast on the same target once every few seconds.

Yasuo teleports to an airborne enemy champion, dealing 200 / 350 / 500 (+1.5 of attack damage) physical damage and holding all nearby airborne enemies up for an additional 1 second. Yasuo also gains maximum Flow, but loses all Steel Tempest stacks. Afterwards, Yasuo's critical strikes ignore 50% armor for 15 seconds.