League of Legends (LoL) Question: Darius vs Riven

Well,if she has Fervor of Battle, she's probably new and doesn't know what she's doing.
However, if she has Thunderlord, is gonna be a medium-impossible lane (depending on skill)

Tips:
You can cancel her Q and E with your E.
NEVER fight her at level 6, she has a inmense power spike, probably higher than yours.
Start Doran Shield and 1 pot (you can start with cloth and 5 pots but i don't have tried this).
Use your Q when she has already used her Q.
Buy early Tabis, they gonna help A LOT.
Do whatever you have to NEVER give a kill to her.
Remember that she is a CD realiant champ, so you have to trade almost instantly before she uses her Q.
Call a gank before lvl 6.
Wait for her to start the trade, when she has used his Q and W,pull him and trade (in this case you have to use Auto-W reset, because she's gonna probably use her E to try to escape)

IMPORTANT:
If you wanna have a first blood, you have to start W, but i don't recomend it (if she kills you, it's GG)
REMEMBER ,that before lvl 16, don't try to kill someone with your ult (expect if the enemy jungler is nearby or you're in a teamfight) , just use it when the enemy has 4 or 5 stacks, the bleeding is much more powerfull than ppl thinks. Obviously, if Riven has her E, she's gonna block some bleeding, but before lvl 6, her shield is not match for your passive (5 stacks)

Well, that's all i have to help you, i'm not really a darius otp but i play him regulary.

to counter riven with darius i will say go tank runes and make 2x item for armor penetration

Well darius is strong in lane phase but not in teamfights like riven cuz he havent dash or something he is easy to poke

Okay so basically filling previous reply. Cancelling her E is pretty much useless, because she will gain shield anyway. Try to E her third Q. Also if you want to hit your Q, which is going to be trouble due to her dashes, try to slow her first with your W, but only after she used her E already

me being a riven main am afraid of darius . his bleed is insane . yes i can trap u with my w and follow up with q r q w q r ignite combo and you would be toast . but if u use your e at me initially and with a good doran my combos would we gone and can kill me easily. with a proper gank you can destroy riven just make sure that she has either used her e or q by then . if riven dies early then u can win easily. so try to kill her before lvl 6 atleast once . at lvl 6 dont 1v1 her even if she has lower health than you because her e is a health boost for a short time . all the best with riven . may u never fight me.