How did aang have friends all over the world at 12 before learning he was the avatar?
From my limited understanding, the air nomads are extremely isolated from the rest of the world, and aang was known to be the avatar very early, so he likely would have been kept safe at the temples while he mastered air bending. So how did he have a friendship with bumi, and also had been to the fire nation? Did he go himself? Did he travel with monks?