Level (LV)
A PC's level represents how experienced and powerful they are. It starts at 1 and increases whenever they Level Up, which they may do when they achieve the required Experience Points.
Level Up
When you level up, you get three Ability Scores increases. You cannot use these to increase an Ability Score to be greater than your Level plus one.
Levelling up may require Downtime or Resting depending on the campaign's pacing.
Max Level
Level 10 is the max level for a PC.