The third most popular class at Turbine, Guardians is the LOTRO main tanks, able to absorb damage and draw enemies to them. They can only really cause damage when they are being attacked up close over a long period of time (though they have a selection of area-effect attacks), so ranged and self-healing enemies are their nemeses.
Because of this, solo-play with a Guardian is much slower, so it is worth staying teamed up all the time something that's true throughout the game for all classes, especially if you are seeking to achieve the deeds that unlock the traits and skills that are key to successful, flexible higher-level play.
It can also be quite expensive being a guardian, due to the tremendous amounts of repairs you have to make - but a kind kinship will help you out there.
The Guardian should be leading any exploration of instances (except, perhaps, for a scouting Burglar), and is best deployed in front of the fragile healers and nukers, but close enough that he can turn and reclaim aggro from them without moving too much.
Attack slowly around a Guardian and let him attack first, so that he can build up and retain aggro it is a lot more difficult to take enemies away from someone else than it is to attract and hold them in the first place. Dwarves are the preeminent Guardians, but humans can also tank perfectly well - think of Gimli or Boromir, if you need an example.
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