Hi summoners(it reminded me nika)
Hope you're enjoying my build. This is my first build on MOBA.(also on internet) Anyway i started playing Fiora when i started play the game because she was free that week. I was trying to find high ad damage champ and she didn't disappoint me at all. I will give you some tips about gameplay.

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Your passive gives you health regen so when you are not at full health use your basic attacks to gain healt regen but don't try to stack them on minions or you may notice you have pushed a bit. It stacks on champions so you can harass your enemy with your basic attacks.

Lunge is a great gap closer that you can use it second time in 4 seconds after your first one. You can jump a minion then a champion and with that move you can even catch an enemy who isn't in your range. It doesn't apply on hit effects but it stacks 1 your E skill's mobility.

Your W give you permanat ad. At first level it gives +15 ad so starting with W is always the best choice. After that it give +5 per level. I recommend maxing E first because you gain +20 ad on level 5 and a good parry damage but when your E becomes 5 level it gives you %120 attacks speed and this makes Fiora deadly. Use your parry to counter enemy empowered basic attacks like Nasus's Q or Darius's W. You can even block apply on hit effect skill like Ezreal's Q or Fizz's Q. If you block these skills succesfully you gain a big advantage against them.

Your E is very important for you. Some champions can make a clever move and stay away from you if you activate your E early. For example, Sion can stun you when you activated your E and it will give him a good advantage. Your E give you nice mobility but not for a long time.

Your ulti is awesome. Never waste it. Be careful when you re using it because after your ulti you can find yourself somewhere else where you started your ulti. With your ulti you can turret dive when you pushed. While turret is attaking minions use your ulti and kill the enemy with your ulti, because you were untargetable you dont gain the turret agro.

You have high base damage so go for armor penetration. CC (espeacially stun) counters you. Try to take tencity. In teamfights use your your ulti at first so everyone take high damage. Ravenous Hydra is very good for Fiora. Your ulti damages all of your enemies with every attack.

Jax is your biggest counter. His stun and dodges makes you useless against him. Tenacity with boots doesnt enough so play defensive against him. Call your jungler to gank quickly. Maybe even in level 2.

Yorick also is one of your biggest counters. Call your jungler as quick as possible. If you have to fight attack him when his skills on cooldown and his wraths down. Make your attacks quick. If he summons wraths again escape to brush and be fast while escaping.

Dont fight him solo. He runs like a girl at first. If you chase him a bit he turns back and becomes a girl on her period. Fiora deals high damage against most champions. Singed takes less damage from her because he usually builds armor. While Fiora fighting enemy usually escapes from her high damage. We all know what happens if singed runs and if you chase him.(Rule 2 Of League of legends: Don't chase Singed.)

Dont scare from Teemo even he can fail your ulti. Before attacking , act like you will attack. Let him blind you then get out of his range until blind is over. After blind, he is yours.

Pros:
-High damage on early game
-At 1 level she is very good at 1vs1 with her W
-Can be untergetable
-High sustain with passive
-Easy to farm with high damage
-High Mobility

Cons:
-Too squishy for a duelist
-ulti may place you in a bad position
-No skillshot