First of all, this is my first guide and hopefully not the last if i get good feedback and also i explain pretty bad so if you have any questions PM russianelit3z on LoL

SPELLS!
Exhaust and Flash, it will be very good to exhaust a champion and team gank the cary or the tank and its a "beacon" to show who we should care about.

How you "should" build riven:
-Get cooldown reduction, why? Because you will need to spam you Q combo alot in teamfights i get to around 4 sec cooldown on it
-Build up her AS, why? personally i like building attack speed because it helps me do damage quicker even if i sacrificed 80 AD item or 100 AD item, with some attack speed i could quickly get to that damage in a matter of hits THIS IS UP TO YOU!
-Build up her life points, why? you will die if you dont simple as that, i realised people care more about ganking you then the tank

Now the way you play her is pretty simple but in same time tricky

You try to keep your distance in the lane because you can get "merkd" pretty quickly, but if they harass you then harass them back with the Q combo. In team fights try to jump in after the tank is in there or a couple of melee's or even the supports and mages.

Hope you guys like this build