User blog comment:Equillibrium/Elder Scrolls Online: Character Progression/@comment-173.189.163.32-20131207193947/@comment-67.171.88.45-20131211045347

Frankly you can completely disregared your class skill lines if you so chose as they are only three skill lines out of the many available in game, with all the others, save for one racial skill line, being available to every player which include mages guild, fighters guild, armor skill lines, weapon skill lines, werewolf, vampires, and even an emperor skill line. The class skill lines are merely there so that right off the bat you can choose an avenue to define your character, as most people will have some idea of how they want to play upon entering the game, and if later you chose that that initial idea no longer appeals to you, its simply a matter of picking up a new weapon and leveling with it, or progressing further into a guild. As for leveling all your skill will level by doing quests, exploring, and killing enemies, but the skills that are represented and being used on your ability bar will level faster.