Riven is an extremely strong champion, her combo sequencing is absolutely devastating for laning solo and in the middle of a team fight. Every game you should try to build to your champion to counter the enemy.
Don't down vote because it isn't IN-DEPTH this is just how I build Riven

Pros
-Good sustain
-Strong 1v1 Champion
-Has a Shield
-Items scale well with her
-Many options for builds
-Can jungle
-Insane passive and Ult that really works well with your moves
-Even off of bad starts I've been able to make easy comebacks
-If your in a bad situation you can use your Ult for kill steals to stay in the game, although its not really good to ks because your team my stop helping you so try to not get in that situation
-Can pick up any kills if you get turret dived
-Can turret dive

Cons
-If your not aggressive you will lose your lane
-Can be harassed a lot
-She isn't the best looking champion
-Not too many cons

While soloing in a lane I generally use my shield to go in then stun, and then I use broken wings to do damage and knock them into the air for even more hits. Some people say to do similar things, but I like this the most, now as you get more advanced try to get basic attacks in between moves to add the damage up faster and secure kills/push out of lane.

Don't focus on getting broken wings up because it doesn't gain any Cool down Reduction while the stun and shield get better cool downs.

I don't recommend this because there are too many better junglers out there and she preforms much better in the lane.