Poppy Runes explained
There's one set of runes for Poppy on patch
11.8
that is the clear favorite for LoL players and pros alike. The best Poppy Runes on the position 
Jungle are Domination as the primary path and
Sorcery as the secondary path with a pick rate of 79%. Besides runes you should take a look on Poppy Build and if you are interested in pro matches take a look at Poppy Probuilds. If you want to discuss
Poppy then you should visit the champion subreddit.
Primary path on Poppy
Domination improves burst damage and assassination tools on Poppy. Most of high elo players – and our LoL pros in the the major regions – have agreed that
Hail of Blades is the best keystone rune to run on
Poppy. This keystone rune helps you to win short damage trades in your lane by increasing your attackspeed at the beginning of a fight. This is usually followed up by taking
Cheap Shot,
Zombie Ward and
Relentless Hunter.
Cheap Shot makes you deal more damage to enemies with impaired movement, which has great synergy with the setup of Poppy.
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.
Secondary path on Poppy
When it comes to your secondary path, most
Poppy players prefer to go with
Sorcery.
Sorcery empoweres abilities of Poppy and increases the available champion resources. On the
Sorcery path, the best runes for Poppy are
Waterwalking and
Celerity.
Waterwalking grants movement speed in the river, which helps Poppy get around the map quicker. The extra damage will also help in those all important dragon and baron fights.
Celerity boosts all movement speed bonuses to Poppy.