Skills in Horizon Zero Dawn are what Aloy uses to defeat Enemies. A list of her Skills can be found here. Aloy will earn XP as she progresses through the game defeating Enemies and completing Quests. Upon leveling, Aloy will earn a Skill point that can be spent on a Skill which will improve her abilities in the game. Override is an ability Aloy possesses, but it is not known if it is part of a Skill path.
Aloy has 3 different skill paths that you can invest points into. They are as follows:
Stealth focused skill path.
Damage dealing focused skill path.
Resource gathering focused skill path.