New skills can be learned every even level (e.g.: Level 2, Level 4, etc.), with the exception of two starting abilities which the player is given upon character creation.
To learn a new skill, the player must either find an instructor related to their class, or go to their skills menu. There are only two types of instructors, Tactics Instructors and Magic Instructors. However, since TERA: Fate of Arun you can learn skills directly from Learned Skill menu (hotkey K), and finding instructor is not needed anymore.Mystics, Priests, and Sorcerers.