Ok I have never actually invested in an enchantment perk because I actually don't understand what they are. The first perk in the tree says enchantments are 20% stronger. Does this mean that enchanted weapons will do more damage and enchanted armors will protect better, etc.? Does it actually mean that the magnitude of the enchantment improves or is it just something that makes the enchantment last longer?

The perk only refers to the magnitude of your enchantments.

Thanks