You are proficient in using Arcane magic. You begin as a novice, capable of casting 1st level spells, you will gradually gain more spells and unlock higher levels of magic as your mastery of arcane energy improves.
This power can behave like any of the arcane magic based classes available such as Wizard, Sorcerer, Arcanist, and even hybrid classes like Magus. The classes are merely guidelines for the unexperienced to follow, you are are not locked into any particular one, and can instead develop any class features available to them.
Outside of the Forgotten Reals or Golarion you are able to cast spells of the 10th level and higher as the gods cannot reach you there.