Pros / Cons
As yasuo, you do have a passive which block out almost anything from Monsters or Champions, so in early game, it is easy for you to cs due to the damage that is ignored
Low Cool down
Very strong due to crit chance
Have a high rate of jukes due to its e
Windwall blocks all projectile Damage
As yasuo, once your passive is used, it takes time to recover, which is your weakest time.
You don't do much damage early game.
You don't take in much damage early or late game due to low health.
First, Statik Shiv
Second(If you want to start on Damage) Infinite Edge
Third(Optional depend on match) Blood thirster(If your enemy deals alot of damage) Phantom dancer(Also a choice of blocking out damage and increase your damage) or Black Cleaver
Fourth, (Could be cooldown Reduction)
Fifth, (Depend on enemy, if enemy deals alot of damage, build things keep you alive)
Sixth, Guardian Angel.