This text assumes a narrative approach to leveling up. This means that the characters advance based on completing quests and pushing further into the story or the world rather than accumulating explicit experience points. This is a preference only and not a rule. GM's should discuss how to handle character advancement with their group.
It is important to remember that each character will always have two tables for advancement, never more or less. They are the General Advancement Table which applies to all characters and a Path Advancement Table on the Path page for each character.
There is a simple guide to leveling up here.