I need help:

My script is - - -

script.Parent.Touched:Connect(function(collision)
if collision:IsA("Player") then
collision.Health -= 15
end
end)

and I'm trying to make it take away health instead of instantly killing you. What seems to be wrong?

you wrote -= 15 instead of = -15

also im not a coder but shouldnt it be collision.Health = collision.Health - 15?

instead of collision.health -= 15 do

collision.health = collision.health - 15

Correct, Polytoria doesn't have fancy operators that Roblox does.

Change "collision.Health -= 15" to "collision.Health = collision.Health - 15"
^ along with this, you should also add a debounce to delay the next damage.