Fiora Runes explained
There's one set of runes for Fiora on patch
11.20
that is the clear favorite for LoL players and pros alike. The best Fiora Runes on the position 
Top are Precision as the primary path and
Resolve as the secondary path with a pick rate of 71%. Besides runes you should take a look on Fiora Build and if you are interested in pro matches take a look at Fiora Probuilds. If you want to discuss
Fiora then you should visit the champion subreddit.
Primary path on Fiora
Precision improves attack and sustained damage on Fiora troughout the match. Most of high elo players – and our LoL pros in the the major regions – have agreed that
Conqueror is the best keystone rune to run on
Fiora. This keystone rune provides additional power in the later stages of a game. As soon as
Conqueror is fully charged, Fiora deals additional damage and gains life steal. This is usually followed up by taking
Presence of Mind,
Legend: Alacrity and
Last Stand.
Presence of Mind helps Fiora with the mana problems by restoring missing mana, if a champion is killed.
Legend: Alacrity grants additional attack speed to Fiora. With
Last Stand you deal more damage while you are at low health.
Secondary path on Fiora
When it comes to your secondary path, most
Fiora players prefer to go with
Resolve.
Resolve empowers the survivability of Fiora and increases the tankiness. On the
Resolve path, the best runes for Fiora are
Unflinching and
Bone Plating.
Unflinching inceases Fiora tenacity based on your missing health.
Bone Plating make Fiora overall tankier, by decreasing the amount of poke damage in the early game.
FAQ for Fiora Runes
Which is the best keystone rune on Fiora?
The best keystone rune on Fiora is
Conqueror.