During character creation take one Skill at Rank 3, two at Rank 2 and three at Rank 1.
The nine Gateway skills are Athletics, Combat, Influence, Linguist, Lore, Pathfinder, Perception, Stealth and Tinker. The three "Saves" - Agility, Endurance and Resolve are also skills (bringing the total to 12). Magic is a 13th Skill only possessed by characters who have taken the Caster Trait.
For more about how Skills are used refer to the Skill Test page of the Game Mechanics section HERE
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Athletics: test for physical stuff like run, jump and climb.
Combat: test to attack or defend.
Influence: test for social interactions like persuasion, deception and performance.
Linguist: test to get a sense of what someone speaking a language you don’t know is saying. Feats give you command of specific languages and the ability to speak and understand them without testing.
Lore: test to see if you know something
Pathfinder: test for outdoor/ranger stuff (like survival)
Perception: test to notice something.
Stealth: test for sneaky stuff. moving silent and/or unseen, hiding, that kind of thing,
Tinker: test to disarm traps, open locks and for mechanical stuff like building and repairing things.
The following 3 skills are “saves” so are always tested as a reaction to something - never as an action.
Agility: used like a Dex save
Endurance: used like a Con save
Resolve: an expression of willpower - used like a Wis save