Aurelion Sol Runes explained
There's one set of runes for Aurelion Sol on patch
11.7
that is the clear favorite for LoL players and pros alike. The best Aurelion Sol Runes on the position 
Mid are Sorcery as the primary path and
Resolve as the secondary path with a pick rate of 55%. Besides runes you should take a look on Aurelion Sol Build and if you are interested in pro matches take a look at Aurelion Sol Probuilds. If you want to discuss
Aurelion Sol then you should visit the champion subreddit.
Primary path on Aurelion Sol
Sorcery empoweres abilities of Aurelion Sol and increases the available champion resources. Most of high elo players – and our LoL pros in the the major regions – have agreed that
Phase Rush is the best keystone rune to run on
Aurelion Sol.
Phase Rush offers more flexibility and options to betake oneself in and out of danger, which can be helpful since that's essentially the main playstyle of Aurelion Sol. This is usually followed up by taking
Manaflow Band,
Celerity and
Gathering Storm.
This is usually followed up by taking
Manaflow Band for additional mana and mana regenaration.
Celerity boosts all movement speed bonuses to Aurelion Sol.
Gathering Storm increases your late game power.
Secondary path on Aurelion Sol
When it comes to your secondary path, most
Aurelion Sol players prefer to go with
Resolve.
Resolve empowers the survivability of Aurelion Sol and increases the tankiness. On the
Resolve path, the best runes for AurelionSol are
Overgrowth and
Conditioning.
Overgrowth increases your maximum amount of health.
Conditioning powers up Aurelion Sol tankiness after the laning phase.