HealthBar Tutorial

local StarterGui = game:GetService("StarterGui")

StarterGui:SetCoreGuiEnabled(Enum.CoreGuiType.Health, false)

local HealthText = script.Parent.Vida
local Bar = script.Parent.Bar
local Player = game.Players.LocalPlayer

repeat wait() until Player.Character or Player.CharacterAdded:Wait()

local Character = Player.Character
local Humanoid = Character:FindFirstChild("Humanoid")

local GreenColor = Color3.fromRGB(0, 170, 0)
local RedColor = Color3.fromRGB(170, 0, 0)
local YellowColor = Color3.fromRGB(154, 154, 0)

Humanoid.HealthChanged:Connect(function(Health)

     local Health = math.floor(Health)

     Bar.Size = UDim2.new(0, Health*2, 0, 20)

     HealthText.Text = tostring(Health .. "%")

     if Health >= 75 then
	Bar.BackgroundColor3 = GreenColor

elseif Health < 60 and Health > 40 then
	Bar.BackgroundColor3 = YellowColor

elseif Health < 40 then
	Bar.BackgroundColor3 = RedColor
    end
end)