How should I go on about putting sanity checks on gun?

Someone reccomended me in the dev forum that I check if it hit something in the client so I made the ray in the client

and this is my local script

local Remote = game.ReplicatedStorage.RemoteEvent

local Tool = script.Parent
local Handle = Tool.Handle

local Player = game:GetService("Players").LocalPlayer
Tool.Equipped:Connect(function(Mouse)
	
	Mouse.Button1Down:Connect(function()
		local ray = Ray.new(Handle.CFrame.Position,(Mouse.Hit.Position - Handle.CFrame.Position).Unit*800)
		local part, position = workspace:FindPartOnRay(ray, Player.Character, false, true)
		local Humanoid = part.Parent:FindFirstChild("Humanoid")
		
		if Humanoid then --If Humanoid is found
			
Remote:FireServer()

		end
	end)
	
end)

But What I dont understand is how would I damage the person safely so that no hacker can just fire a remote to exploit

my server script

game.ReplicatedStorage.RemoteEvent.OnServerEvent:Connect(function(player)

What checks should be put here?

end)

Honestly you can never be 100% secure from 'Hackers'. Especially with Server/Client lag..

But something you could do is: you could send their origin and their 'end point' and do some checks with it.

see if their origin is within like 5 studs of where the ray is being created from. or see if the origin to the endpoint is within so many studs.

There are honestly a lot of 'sanity checks' you could do...

But you have to be careful with it. Because sometimes players with bad internet may seem like their 'exploiting' when their just lagging.