I will tell you how. You have to learn how to fight.
There are two techniques that you must employ to be successful in Tamriel.
Blocking and Interrupting.
Blocking is used to not take as much damage and to control your opponent. When there are white lines coming from your opponent, this is a power attack. Press and hold the right mouse button until the attack hits you. Then the enemy will be disoriented and you follow up with a power attack (holding down the left mouse button).
Interrupt is used to stop someone from doing a charged attack (channeled ability) and the visual queue are red lines coming from your opponent. Hold down the right mouse button and the tap the left mouse button. This will disorientate your opponent and you can follow up with a power attack to knock em down and do more damage.
When people were having trouble with Doshia (first boss in the Fighter Guild quest line) people were talking about their builds being all wrong. Certain classes had an edge over other classes.
Well that is just total crap, and an excuse.
What I did was take a video of a Nord Sorcerer with no skill points used (except one for each skill set) and no passives, no attribute points and all crafted equipment with no bonuses on em and the Restoration staff going toe to toe with her.
The reason is to show everyone that if you can master the two techniques above you can take just about anything on.
This is not a boast, just trying to help others understand how combat works in TESO.
https://www.youtube.com/watch?v=WNb0qv6De_M