Bard Runes explained
There's one set of runes for Bard on patch 14.9 that is the clear favorite for LoL players and pros alike. The best Bard rune paths on the position 
Support are 
Resolve as the primary path and 
Domination as the secondary path with a pick rate of 75%. Besides picking runes on Bard you should learn how to play Bard and if you are interested in pro matches take a look on how a pro builds Bard. If you want to discuss 
Bard then you should visit the champion subreddit.
Bard runes from primary path
Resolve empowers the survivability of Bard and increases the tankiness. Most of high elo players – and our LoL pros in the the major regions – have agreed that Guardian is the best keystone rune to run on Bard. This keystone rune grants a shield to your teammate and towards your own, as soon as one of you gets damage by an enemy champion. Other primary runes on Bard are Font of Life, Bone Plating and Unflinching.
Font of Life provides your teammates with more sustain by healing them whenever they attack a champion whose movement you've recently impaired. Bone Plating make Bard overall tankier, by decreasing the amount of poke damage in the early game. Unflinching inceases Bard tenacity based on your missing health.
Bard runes from secondary path
When it comes to your secondary path, most Bard players prefer to go with Domination. Domination improves burst damage and assassination tools on Bard. On the Domination path, the best runes for Bard are Zombie Ward and 
Relentless Hunter.
Zombie Ward helps you to expand your vision on the map. Vision is very
crucial in LoL and helps you to avoid unnecessary deaths. Relentless Hunter increases your movement speed out of combat due to every unique champion takedown.
FAQ for Bard Runes
Which is the best keystone rune on Bard?
The best keystone rune on Bard is Guardian. This Bard runes setup is then referred as Bard Guardian.
What runes does Bard use?
Runes from the paths Resolve and Domination are the most used runes on Bard. For the exact pick rates of Bard runes used, you have to study the rune distribution presented.