I want to get a cool down on my weapons. But how?

This is the script: local tool = script.Parent local canDamage = false

local function onTouch(otherPart)

local humanoid = otherPart.Parent:FindFirstChild("Humanoid")

if not humanoid then 
	return 
end

if humanoid.Parent ~= tool.Parent and canDamage then 
	humanoid:TakeDamage(25)
else
	return
end

canDamage = false

end

local function slash() local str = Instance.new("StringValue") str.Name = "toolanim"--tool animation str.Value = "Slash" str.Parent = tool canDamage = true end

tool.Activated:Connect(slash) tool.Handle.Touched:Connect(onTouch)

it has a local script too but that's for the animation. I want it to have the cooldown because if it doesn't people will be spam clicking and instakilling other players.

You can make a variable on the top and it will refer to a number. Then, add wait(thevariable) before canDamage = false. If you are confused, this is what I mean.

cooldown = 3   --You make this at the top so you can adjust it more convenient

local tool = script.Parent 
local canDamage = false
local humanoid = otherPart.Parent:FindFirstChild("Humanoid")

if not humanoid then 
	return 
end

local function onTouch(otherPart)
	if humanoid.Parent ~= tool.Parent and canDamage then   --You check if the player can attack here
		canDamage = false   --We make the player cannot attack once they activate the tool.
		humanoid:TakeDamage(25)
		wait(cooldown)   --Then, wait the 3 seconds then we make the player can attack again.
		canDamage = true   --After that, we make the player can attack again.
	else
		return
	end
end

local function slash() 
	local str = Instance.new("StringValue") 
	str.Name = "toolanim"
	str.Value = "Slash" 
	str.Parent = tool 
	canDamage = true
end

tool.Activated:Connect(slash) 
tool.Handle.Touched:Connect(onTouch)