"make a script with a draggable gui that gives me the option to change the amount of health I have"

-- local script inside a draggable GUI 
local player = game.Players.LocalPlayer
local character = player.Character or player.CharacterAdded:Wait()
local humanoid = character:WaitForChild("Humanoid")

local gui = script.Parent
local healthSlider = gui.HealthSlider
local healthValue = gui.HealthValue

local function updateHealth()
    local newHealth = tonumber(healthValue.Text)
    if newHealth and newHealth >= 0 and newHealth <= humanoid.MaxHealth then
        humanoid.Health = newHealth
    else
        healthValue.Text = tostring(humanoid.Health)
    end
end

healthSlider.MouseButton1Down:Connect(function()
    local mouse = player:GetMouse()
    local dragging = true
    local initialPos = gui.Position

local function drag()
        if dragging then
            local newPos = UDim2.new(0, mouse.X, 0, mouse.Y)
            gui.Position = newPos
        end
    end

mouse.Move:Connect(drag)
    mouse.Button1Up:Connect(function()
        dragging = false
    end)
end)

healthValue.FocusLost:Connect(updateHealth)