What are skill caps and how do they raise?
Skill caps are the maximum level that you can currently raise a given skill. Skill caps are raised by leveling (weapon skills) and by receiving training (professions and secondary skills). For weapon skills, gaining a level of experience will raise the cap for each weapon skill by 5. For tradeskills, your profession rank – apprentice, journeyman, expert, artisan, and master – determines your maximum skill level. These ranks are gained by receiving training (from NPCs and/or books) and have minimum skill and level requirements.