I didn't make this guide to show you what's best, and I really don't have that much experience with Yasuo, but this Guide works pretty good and it's pretty fun.

With these runes you will achieve your Max CD on Q very early and makes you have a great midgame. Look at "Notes for Runes" for more info.

Basic masteries - Masteries notes for more info.

As seen in the guide you start with Hunter's machete, into Cinderhulk (red or blue smite). Get a Trinity Force and Statikk Shiv for damage. Then get tanky items. These Tanky items can be all sorts of items. Good options are:
Sterak's Gage: This build focuses primeraly on Base ad as you will have 0 Bonus AD, getting a Sterak's Gage is a more offensive option if you are ahead, go for it.

Randuins Omen: Good for the slow in teamfights, good against Their adc and like a Tryndamere or so (CRITS!!)

Dead Mans Plate: Great for initiating as you are tanky and with more movement speed you will be even better at engaging and locking down their ADC.

Banshee's Veil: Get a Banshee's veil when their AP is very strong or have something like a blitz hook that will **** you over if you don't have this item.

Frozen Heart: This item gives you mana, which is useless, but also CDR, armor and an Attack speed slow. Only buy this if they have alot of Attack speed heavy champions.

Zz'Rot Portal: This item gives just as much MR and Armor as Guardian Angel but alot of movement speed buffs, get this when you want to iniate and need MR and Armor, The split pushing part is also very nice if you need it.

Q for clear, Max E after putting a few points into it. Always take ult when you can. More info on the Abilities Page.

To summarize, strong midgame with Trinity and Max CD Q, good initiation and VERY Tanky lategame.