i try this but it doesn't work? it's so weird
workspace.fistter1.Humanoid.Health + 100
any help is appreciated!!
You almost had it. Take the players health and add 100. I wouldn't recommend this way of referencing a players character, but without additional info, this is how you'd fix your script.
workspace.fistter1.Humanoid.Health = workspace.fistter1.Humanoid.Health + 100