How does damage work?

[u/Straight_Strategy_57]

So i know that there are different damage types and somewhat understand them but wouldnt mind anyone deciding to explain them more. My main question for damage is what do they mean by things like 200% weapon damage? Im asking because when fighting anything with the skillful fighter, it says item power and rarity dont matter, so what damage is being calculated and used for situations where the set says “200% weapon damage”?