There are a few tips that people already know about facing a Yasuo; poke his shield off with autos, he's weakest right after his tornado is gone, and he's weak to ganks. I'd like to go into more detail.
The key to beating a Yasuo in lane is proper minion management, and proper management is different depending on whether you're a ranged or melee champion. As a ranged champion, you want to keep the wave in 1 of 2 places depending on Yasuo's health relative to yours. If Yasuo is ahead or even, you want to keep the wave frozen a bit outside of your own tower, so that he has to go into tower range to order to hit you. You can basically do whatever you want to him if the wave is in this spot because you can simply retreat into tower range if he tries to go onto you. However, if you're ahead of him in health, you want to start a slow push, so you can poke him whenever he tries to CS and you'll have a buffer of minion support if he tries to all in you. In this case, he can't do much either.
For a melee champion, you want to slow push pretty much all the time. Yasuo is extremely vulnerable to being all inned by melee champions when he's trying to CS, and a good Yasuo will try to do a slow push of his own to discourage his opponent from attacking him. One important thing to understand is that while enemy minions are oftentimes Yasuo's best friends since he uses them to dash, they are also one of his biggest weaknesses since he's required to tank them in order to trade. If you can bait him into tanking a lot of minions with some kind of defensive ability like an ori shield, you can very easily come out ahead in trades, provided you don't panic, keep autoing, and hit some extra free damage on him when he tries to get out.
Generally speaking, a Yasuo will always want the wave in 1 of 2 places. He either wants a slight minion advantage on his side so he can get free opportunities to poke with Q, but not so many more minions that the wave gets frozen outside the enemy tower. A good Yasuo will bait you into hitting minions with AOE abilities to push the wave back towards him if it starts to get too close to tower, allowing him to be aggressive again. The other position is for when Yasuo has a lead on his opponent; he will want to freeze outside of his tower, leaving a long trail of minions to dash through so he can all in you if you try to walk up to CS. The key to beating Yasuo is to keep the wave where you want it to be rather than the way he wants it to be, or there's not a whole lot you can do as a lot of champions.
Other general tips for beating Yasuo include: Ask for ganks, an aggressive Yasuo player is very easy to bait and kill if he isn't strong enough to 1v2 already. Take exhaust as a combat summoner if your kill pressure on him is low, it’s a great way to neutralize his aggression in lane as well as neuter him in teamfights. If Yasuo misses his tornado, that is the time to be aggressive. His Q is on CD, he has no CC for a while, and his ult, by extension, is unavailable. And if Yasuo gets too aggressive in lane and messes up when trying to trade, all in him right then and there. If you get a lead against Yasuo, most champions will be able to zone him out heavily since he's a squishy melee only champion with no escape and no natural sustain.
:)
They also are one of the best lane bullies
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replaces BT if going Merc.
--Additionally, keystone can be Grasp (effective lifesteal based on hp) or Warlord's (effective lifesteal based on hp%), though Fervor is also common to make up for damage lost by forgoing BT
-Frozen Mallet's HP will give Yasuo near 3k hp which is on par with many tanks
-Guardian Angel resistances top off resistances offered by other items, offering ~150 armor and magic resist, roughly
