Here is a LOTRO Tanking Guide.Hope this article can help you...You can learn some skills throught this guide.

Concept 1) Hate/Threat/Arggo

The three terms are all interchangable. Each time you fight a monster (mob) he generates a hate list per combat. Whoever has the most hate the mob attacks.

Hate is quite complex because of how the game works. The best way of understanding it is by thinking as if you were the monster (mob) you are attacking.

If a hunter "pulls" (the act of initiating the combat) the mob will attack whoever is closest first. And by the time other people run in to attack, the mob will be focused on the first person and positioned to attack the person who "pulled" him. So whoever starts the combat start at the top of the mobs hate list. You should wait till at least the healer has full power before pulling (unless the healer asks you to go.)
For this reason you should alway ask to pull, and always do the pulling. If someone else pulls its makes it harder for you to be top of the hate list.

A simple test will show you that if a guardian and hunter auto attack 1 mob, the hunters DPS will be higher than the guardians. A High DPS class will create a high amount of hate. If you think like the mob this is quite simple why he would attack the hunter. The logic is that if someone is hitting you very hard, you try to kill them first

Guardians lack high DPS of say hunters, however we do have hate increasing moves. Such as shield swipe, Challenge and vexing blow are just a few to name. Hate increasing moves can be best thought as annoying moves on the mob. For example challenge makes your guardian laugh at the mob. If i was fighting a thingyy dwarf who started laughing at me, i would be very tempted to give him a slap! Same with Shield swipe. Someone smacking you with a shield is not exactly pleasant.
For these reasons you should focus on doing your best increased hate moves. This will in essence **** the mob off so he attacks you.

Other than your fellowship members gaining hate via DPS, Minstrels generate hate via healing. Again using the idea of thinking as if you were the mob. If you nearly kill someone, and then someone restores them to full health that would make you want to attack the healer.