I heard the enchantment Protection is only effective on one piece of armor because it doesn't scale with the other pieces of armor. Therefore, a different type of protection should be used on every piece of armor. E.g. Fire protection. Is this true? Please only if someone is honestly knowledgeable
No, if you use different protection enchants they will not work
No, that is wrong.
The more parts you have protection on, the better. That adds up. Another type of protection is not necessary.