Perks are abilities - passive or active - that allow your character to learn new skills (like fishing) or become a better fighter (by increasing your damage or endurance, for example).
They can be unlocked in the Perks tab of the in-game menu.
Each Perk costs Perk Points, which can be gained by completing various objectives in-game.
You can view the available objectives and the number of Perk Points they award in the Challenges tab of the in-game menu.
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