Armor classes

[kaka]

Could you explain them?
I think I can guess what is better, but I would like to know what the numbers actually mean.

[loftar]

If a piece of armor has armor class X/Y, it means that it can absorb X hitpoints without taking damage, and then absorb Y more hitpoints, subtracting them from its HP. If you have several pieces of armor equipped, their damageless absorption takes precedence, and any absorption that deals damage to the armor is dealt evenly over the pieces equipped.

For example, if you have leather armor (1/2), leather pants (also 1/2) and leather boots (0/2) equipped, and you take 5 points of damage, 2 points are absorbed damagelessly, and the three remaining points are distributed evenly, so that each piece takes one hitpoint of damage. It would take 9 points of damage or more from an attack to actually deal damage to the player.

[dantedevil]

How do you repair your armor after it has no hit points

[Alamarian]

How do you repair your armor after it has no hit points

You don't. You make new armor.