"make a script where above all players heads it will say lives left you start with 5 each time a player kills somone they get one of there lives"

-- server script (ServerScriptService) 
local Players = game:GetService("Players")

local function onCharacterAdded(character)
    local humanoid = character:WaitForChild("Humanoid")
    local player = Players:GetPlayerFromCharacter(character)
    local lives = Instance.new("IntValue")
    lives.Name = "Lives"
    lives.Value = 5
    lives.Parent = player

local billboardGui = Instance.new("BillboardGui")
    local textLabel = Instance.new("TextLabel")

billboardGui.Adornee = character.Head
    billboardGui.Size = UDim2.new(0, 100, 0, 50)
    billboardGui.Parent = character.Head

textLabel.Size = UDim2.new(1, 0, 1, 0)
    textLabel.BackgroundTransparency = 1
    textLabel.TextColor3 = Color3.new(1, 1, 1)
    textLabel.Parent = billboardGui

local function updateLives()
        textLabel.Text = "Lives: " .. tostring(player.Lives.Value)
    end

player.Lives.Changed:Connect(updateLives)
    updateLives()

humanoid.Died:Connect(function()
        local killer = humanoid:FindFirstChild("creator")
        if killer then
            local killerPlayer = Players:GetPlayerFromCharacter(killer.Parent)
            if killerPlayer and killerPlayer ~= player then
                killerPlayer.Lives.Value = killerPlayer.Lives.Value + 1
                player.Lives.Value = player.Lives.Value - 1
            end
        end
    end)
end

Players.PlayerAdded:Connect(function(player)
    player.CharacterAdded:Connect(onCharacterAdded)
end)