"script a tool that when you click on someone, the person who clicked is grabbed by the neck, and if you click again, it makes an animation throwing him to the ground taking 20 damage. Put comments explaining where to put each script"

-- This script should be placed in ServerScriptService 
local tool = Instance.new("Tool")
tool.Name = "GrabThrowTool"
tool.RequiresHandle = false
tool.CanBeDropped = false
tool.Parent = game.ServerStorage

-- This script should be placed in StarterGui 
local player = game.Players.LocalPlayer
local mouse = player:GetMouse()
local tool = game.ServerStorage:FindFirstChild("GrabThrowTool")
local grabbed = false
local grabbedPlayer

mouse.Button1Down:Connect(function()
    local target = mouse.Target
    if target then
        local humanoid = target.Parent:FindFirstChild("Humanoid")
        if humanoid then
            if not grabbed then
                grabbed = true
                grabbedPlayer = target.Parent
                tool:FireServer("grab", grabbedPlayer)
            else
                grabbed = false
                tool:FireServer("throw", grabbedPlayer)
                grabbedPlayer = nil
            end
        end
    end
end)

-- This script should be placed in ServerScriptService 
local tool = game.ServerStorage:FindFirstChild("GrabThrowTool")
tool.Activated:Connect(function(player, action, target)
    if action == "grab" then
        -- Grab the player by the neck
        local neck = target:FindFirstChild("Neck")
        if neck then
            neck.C0 = CFrame.new(0, 1, 0)
        end
    elseif action == "throw" then
        -- Throw the player to the ground and apply damage
        local humanoid = target:FindFirstChild("Humanoid")
        if humanoid then
            humanoid:TakeDamage(20)
            humanoid.Sit = true
            wait(1)
            humanoid.Sit = false
        end
    end
end)