Light armor and heavy armor is made up of mixed
amounts of leather and armor.
Plate armor, on the other hand, is made entirely of iron.
That gives it extraordinary defensive capabilities.
But here's the catch. To use it, you must advance your
Plate Armor Proficiency, but that skill is tougher to
advance than other armor proficiency skills.
Also, plate armor is heavier than other types of armor.
Get all that? Good!
Now try collecting the Light Plate set.
It will give you a good foundation to understanding plate armor.