You were raised in or very near to the mystical city of Astora, and thus have benefited from being brought up near the magically-imbued city. This provided you with some extra advantages growing up in or around the city, where most any path would be open to you, should you simply wish to take it.
Taking this background confers the following:
Languages. You can read, speak, and write Common and Nathian. Nathian was the langauge of the Nathian kingdom of old and has remained the dominant language of the region where it once stood. It is a particular point of pride of the “Nathian aristocracy,” well-to-do citizens of the city of Nath.
Starting Gold. If you choose to use starting gold as an option for equipping your character, you have an extra 2d6 x 10 gp to begin with to spend on supplies.