In the first part: Advanced Tutorial 1: Leveling, you will be taught about how to power level and how to level skill trees efficiently.
Powerleveling is the act of increasing one's character level in extremely high speed in the least amount of time possible. In Elder Scrolls Online, powerleveling also is possible. In this tutorial you will learn how to.
While you level up, you earn an attribute point and a skill point. Spending all those points into one specific skill tree sounds like a good plan, but quite the opposite it true. You will find yourself wasting experience on a level 50 skill tree and not get the full benefit from questing and leveling. So how to tackle this issue?
You can read more about leveling in Advanced Tutorial 1: Leveling