How to make touch event on parts?

I cant find anything about part touching part. Im talking about that if part touched another part then something happens . Plz write in answers. :-

To do a touched event, you could write it like this (as an anonymous function).

--// This script must be inside of your part

script.Parent.Touched:Connect(function(hit) --// If the script's parent (the part) is touched then it will connect this function and log what hit it (logged through the "hit" parameter).

-- Put what happens here (i.e. transparency changes, brickcolor changes, etc.

end)

Code you need:

function OnTouch(hit)
--your code here
script.Parent.Touched:Connect(OnTouch)

Example of use (my fire script):

local val = 0
function OnTouch(hit)
	local head = hit.Parent:FindFirstChild("Head")
	local human = hit.Parent:FindFirstChild("Humanoid")
	if human ~= nil then
		local GC = hit.Parent:GetChildren()
		for i, v in pairs(GC) do
			if v:IsA("BasePart") then
				if v:FindFirstChild("FireEmmiter") == nil then
				local Particle = script.Parent:FindFirstChild("FireEmmiter")
				local ParticleClone = Particle:Clone()
				ParticleClone.Parent = v
				val = val + 1
				if val == 16 then
			    val = 0
					while true do
						wait(0.025)
						human.Health = human.Health - 1
						if human.Health == 0 then
							local s = hit.Parent:FindFirstChild("Shirt")
							local p = hit.Parent:FindFirstChild("Pants")
							for i, v in pairs(GC) do
								if v:IsA("Accessory") then
									v:ClearAllChildren()
								else if v:IsA("BasePart") then
								v.Material = Enum.Material.Slate
								v.Color = Color3.fromRGB(27, 42, 53)
								if s ~= nil then
									s:Destroy()
								if p ~= nil then
									p:Destroy()
									end
								end
								end
							end
						end
						end
					end
					end
				end	
				end
				end
			end
			end
script.Parent.Touched:Connect(OnTouch)