This forum can give you more information than you will ever need, check out some of the builds and tips and tricks!
http://tamrielfoundry.com/forum/classes/dragonknight-class/
Unlike most MMOs, you won't be able to keep aggro on every mob, or so I've read from others and experienced so far as a healer. So find the strongest thing, keep its attention (and a few nearby if possible), and focus on block/dodge/bash to keep yourself alive. There are situations where missing even one block means you're gonna have a bad time.
GOOD TANKS ARE MANY!
YOU MUST STRIVE TO BE A GREAT TANK!
TO BE A GREAT TANK, ONE MUST POSSESS SEVERAL THINGS!
- Confidence
- Muscles
- Facial scars
- All Attribute Points in Health
- Health potions
- Amazing, glorious maximum health food
- The blessing that is Sanguinaire Vampiris
- Women
- CONFIDENCE!! ! !!!!
ATTAIN THESE FELLOW DRAGONKNIGHT AND WITH THEM POWER, WEALTH, STATUS, FAME AND GLORY SHALL ETERNALLY BE YOURS!
HAIL SITHIS!
(I'M WALKING BACK AND FORTH WITH MY HANDS BEHIND MY BACK ON A STAGE SHOUTING THIS AT YOU AND THE REST OF DRAGONKNIGHT COMPANY!)