Not Updated For Current Season
With this build, Galio starts with 87 magic resist and 44 AP, making it difficult for enemies to push you at early levels without suffering major damage (especially mages). They normally back away quickly. I build Guardian Angel first for survivability, and both armor and even more magic resist (more AP). Your next items will depend on the team you are facing and more importantly early game the champions you are laning against.
If the lane enemies are caster heavy go with Abyssal Scepter or Banshee's Veil, if they are melee/dps/tank, go with Sunfire Capes. If the team is balanced I mix it up, first going with the items that would most benefit facing the enemies in my lane, then the others.
- If the team has a lot of stuns/snares, I would go with Banshee's Veil first after Guardian Angel.
- If the team has high dps champions, go for Sunfire Capes after Guardian Angel.
I go with Clarity and Teleport because it helps me stay in lane much longer as I can alternate between Clarity and Teleport for mana while not losing any valuable early game experience. The down side is if you get ganked, your are pretty much dead unless you see it coming and can get away in time. If you prefer to go with Flash/Ghost/Cleanse, that's your preference. To use Clarity and Teleport you must watch the mini map and be aware of missing enemy champions. If I have the gold sometimes I buy sight/vision wards to place in the river and nearby jungles.