Why does my gun not work server sided?

So I made a script, and it works. However, I tested it me shooting another player. It shows that it does damage on my screen. However, it does not deal damage on theirs. Please help! Here is the code, the code was done on a local script:

local Debris = game:GetService("Debris")

local LaserGun = script.Parent
local Tip = LaserGun.Tip

local Player = game.Players.LocalPlayer
local Character = Player.Character

local GunDamage = 30


LaserGun.Equipped:Connect(function(Mouse)
	Mouse.Button1Down:Connect(function()
		local Laser = Ray.new(Tip.CFrame.p, (Mouse.Hit.p - Tip.CFrame.p).unit * 300)
		local HitPart, HitPosition = game.Workspace:FindPartOnRay(Laser, Character, false, true)
		
		local LaserBeam = Instance.new("Part", game.Workspace)
		LaserBeam.BrickColor = BrickColor.new("Fossil")
		LaserBeam.FormFactor = "Custom"
		LaserBeam.Material = "Neon"
		LaserBeam.Transparency = 0.25
		LaserBeam.Anchored = true
		LaserBeam.CanCollide = false
		
		local LaserDistance = (Tip.CFrame.p - HitPosition).Magnitude
		LaserBeam.Size = Vector3.new(0.3, 0.3, LaserDistance)
		LaserBeam.CFrame = CFrame.new(Tip.CFrame.p, HitPosition) * CFrame.new(0, 0, -LaserDistance/2)
		
		Debris:AddItem(LaserBeam, 0.1)
		
		if HitPart then
			local HitHumanoid = HitPart.Parent:FindFirstChild("Humanoid")
			
			if not HitHumanoid then
				HitHumanoid = HitPart.Parent.Parent:FindFirstChild("Humanoid")
			end
			
			if HitHumanoid then
				HitHumanoid:TakeDamage(GunDamage)
			end
		end
	end)
end)

Please help! Like is there an easy video or anything?

Local script means its only for that player that changes happen, it doesnt replicate to the server

You are gonna need remote events

then using that event u fire a function inside a script that does the actual dmg so that it replicates to all players

edit:

in the mouse.Button1Down event put remoteEvent:FireServer(HitHumanoid) and in the script u put

remoteEvent.OnServerEvent:Connect(function(player,enemy)

enemy:TakeDamage(10) -- or whatever
end)