Fiora is a melee attack damage champion, who does very good damage late game, and can be pretty tanky if built well.

Her abilities are very helpful in teamfights, but she is a very strong fight 1v1 aswell.
I personatly play her as a split pusher. Becouse of her good attack speed with Burst of Speed, after you buy Ravenous Hydra you clear waves extremely fast. So as soon as I see an opportunity, I go away from my team, and split push, this also makes your teamfights easier. Becouse usualy you can take one or two opponents easily, so they have to send multiple people to stop you. Which ether means your team will kill them easy, or you will get an enemy tower, and if you're doing everything correctly even an inhibitor :).

SPACEBAR Pros: Very high burst damage Very good teamfight potential Ultimate makes you untargetable Can block abilities like Nasus' Q with her W

SPACEBAR Cons: Quite weak early game If focused and cc'ed dies fast No crowd control

BARStarting items:

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SPACEBARI suggest to start off with a couple of Rejuvenation Bead and Health Potion, ofcourse also a viable start is 1 Rejuvenation Bead, 1 sight ward and 5 Health Potion

BARFirst recall:

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SPACEBARThe first time you recall, try to get Ravenous Hydra or atleast a Tiamat and atleast Boots, becouse after Tiamat your kill potential skyrockets!

BARFull build:

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SPACEBAR Mercury's Treads or Ninja Tabi - Fiora deals a lot of damage sure, but she needs survivability aswell, since she is very susceptible to crowd control, I recommend Mercury's Treads for 35% reduction to all cc, but if your opponent team has no, or almost no crowd control, get Ninja Tabi so you can 1v1 their ad carry. Also with Enchantment: Furor you can stick to targets very easily, this + speed boost from your Burst of Speed and you can catch up to absolutely anyone, unless they flash over a wall ofcourse.
SPACEBAR Ravenous Hydra - This item provides you with quite a bit of attack damage, better than most attack damage items, also a little bit of health regen and lifesteal. But the reason to get this item is the passive and the active. The passive makes your attack damage spread, which works extremely well with your ultimate, if there are two or more enemies in one place, they will take massive damage from your ultimate after you have this item. Also this item's active can be used to make you attack faster, simple idea: you auto attack, use the active, and it resets your auto attack again, pretty much 3auto attacks in speed of 1or2 depending on how fast you do it.
SPACEBAR Maw of Malmortius - This item provides you with a nice boost in attack damage, and magic resistance, so you can survive longer if getting focused. Also the passive is very useful, if you take magic damage below 30% health, it gives you 400hp shield... Now think about it, how many times has it been that you died to the last tick of ignite?
SPACEBAR Blade of the Ruined King - This item isn't one of the items you should rush, becouse most likely your opponents won't have that much max health early on. But if you buy it as a 4th item, by that time your opponents should have some health, so it will come in handy, and it also procs on your ultimate, and with ravenous hydra it splashes, so even if you attack the tankiest person on the enemy team, it will damage his team mates nearby a lot.
SPACEBAR Last Whisper - By the time you get this item, your opponents will have noticed you deal a lot of damage, and start stacking armor, some of them might even get a thornmail just to annoy you.
SPACEBAR Guardian Angel - This item provides you with survivability, in case you don't play safely and get cought out of position, this will give your team mates time to come and maybe even turn it arround enough to win the game right there.

BAROther viable item choices:

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SPACEBAR Berserker's Greaves - These boots should only be bought, if the opponent team doesn't realy do enough damage to kill you, which happens only if you're fed and get Ravenous Hydra and Blade of the Ruined King extremely fast.
SPACEBAR Enchantment: Homeguard - This boot upgrade should be purchansed if your team is losing, and you're fighting in your base, defending the nexus towers.
SPACEBAR Phantom Dancer - Can be gotten if your opponent team is very far behind, and don't do any damage to you even with Berserker's Greaves, Phantom Dancer will provide you with almost same movement speed as Berserker's Greaves, but give more attack speed, critical chance, and the ability to move through units.
SPACEBAR Bloodthirster or Infinity Edge- Can be gotten if the opponent team doesn't do much damage to you, but you kill them too slow and just want to speed things up a little bit.
SPACEBAR Frozen Mallet, Randuin's Omen and Warmog's Armor - are all mostly for defenses, if you're lacking health, Frozen Mallet if you want damage with the health, Randuin's Omen if you want armor, and Warmog's Armor if you want more regeneration.

SPACEBAR Lunge - This is your Q ability, which is your gap closer, with this ability you can pull off very neet tricks since it alowes you to jump twice, so you can use the first jump on the minion to get in range, and the second jump on the champion himself.

SPACEBAR Riposte - This is your only defensive ability aside from your ultimate's invulnerability, but I recommend maxing it first, becouse the passive gives you a nice boost in attack damage, and also when maxed can deal a suprisingly big amount of damage.

SPACEBAR Burst of Speed - This is one of the best steroid abilities in league of legends, which gives you a great boost in attack speed, up to 120%, thats why Fiora doesn't need attack speed items. Also this ability grants you movement speed uppon hitting an opponent, so it's a good ability to use if you want to keep up with someone.

SPACEBAR Blade Waltz - This is Fiora's ultimate ability, which makes you untargetable, and deal a lot of damage to all opponents nearby. You pretty much jump from target to target, dealing massive damage to them and applying on-hit affects, but it is very useful on a single target too, becouse every consecutive hit on a single target, deals extra damage, this ability also works very well with Ravenous Hydra, making it a very good aoe ability in teamfights.

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SPACEBARFor Fiora I suggest focusing on damage masteries, becouse that is what she's made for - taking out opponents before they can react.

BARMasteries worth talking about:

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SPACEBAR Butcher and Destruction - These are masteries made especialy for split pushing, becouse that what Fiora excels at after purchansing Ravenous Hydra

SPACEBAR Weapon Expertise and Sunder - These two masteries provide you with enough armor penetration to take on even the toughest tank 1on1, without them people would just stack armor vs you and there'd be nothing you could do.

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SPACEBAR Greater Seal of Armor - These runes provide you with much needed armor early on, becouse Fiora's base armor is actualy very low, and you need to defend yourself somehow!

SPACEBAR Greater Mark of Attack Damage - These runes help you out with last hitting, and trading with opponents early on, it might not be too much, but how disapointed would you be dieing when opponent has 5hp when you don't use these :P

SPACEBAR Greater Glyph of Magic Resist - These runes help you defend from enemy mid ganking you, or ability power junglers like Amumu, Fiddlesticks and so on.

SPACEBAR greater quintessence of armor penetration - This helps you out if your opponent has got a lot of armor runes prepared for you early game.

BARMostly used spells:

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SPACEBAR Ignite and Flash - These two spells provide you with a good escape if you get in trouble, and the ability to finish off single targets at low health.

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BAROther viable spells:

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SPACEBAR Ignite and Exhaust - This combo is extremely powerful in 1v1 situations, but not very good when there's more than one target on the field.
SPACEBAR Exhaust and Flash - This combo is a lot like the mostly used one, just that instead of taking Ignite to finish off people, you take Exhaust to weaken and slow the targets.
SPACEBAR Teleport and Ignite - This combo is for split pushing, so that you can go split push, and if your opponents engage, you can teleport to a ward or something and help your team. The Ignite in this combo can also be replaced with Exhaust for same reasons as with Flash.

Fiora is an extremely good farmer after buying Ravenous Hydra, by that time your Riposte should be max and you have over 150attack damage, so you can kill a minion in just a couple of shots, also the damage spreads, so by killing 3minions you might actualy kill 6 just by splash damage. Fiora is an extremely good split pusher, but we talked abaut that in he mastery page so why bring it up again. Just know this: when playing Fiora cs will never be an issue.

SPACE Fiora is extremely useful in teamfights, becouse of her amazing aoe with Blade Waltz and Ravenous Hydra. Altho she shouldn't be the one to go in first, becouse that way you will get focused and cc'ed which will completely shut you down.

BARAltho if your opponent team hasn't been doing very well, or doesn't have crowd control, or you're just fed... You can do what this guy did: Play Video
Don't mind the kill count at right side, it's becouse of a replay bug.

BARWhat to pick to counter Fiora? How does it work?

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Jax - Because Counter Strike dodges Blade Waltz, and if timed correctly can even stun Fiora.

Vladimir - Because Sanguine Pool stops Blade Waltz completely, it doesn't even continue on after pool duration.

Kha'Zix - If he uses Void Assault, Blade Waltz shuts down.

Akali - Because Twilight Shroud shuts down Blade Waltz.

Elise - Rappel provides an escape and shuts down Blade Waltz.

Kayle - If she casts Intervention, Blade Waltz will do no damage.

Malzahar - Malefic Visions damage Fiora while Blade Waltz is active.

Mordekaiser - Children of the Grave deal damage to Fiora while Blade Waltz is active.

Teemo - Blinding Dart makes Blade Waltz miss.

Wukong - If cast Warrior Trickster, Blade Waltz will damage the decoy instead.

Nunu & Willump - If well timed, Absolute Zero can kill Fiora when Blade Waltz ends.

Zhonya's Hourglass - Completely shuts down Blade Waltz if there are no other enemies nearby

Thank you if you read my entire guide, please rate and comment, and feel free to ask any questions in the comment section. Negative feedback very welcome because it's my first build ever made and I gotta learn from my mistakes :)