How do I make a GUI button give me + 1 money every time it is clicked?

Your current line player.Character.leaderstats.OoferBucks.Value = 1 The problem with this, is that it will constantly set the value to 1, instead of adding.

First of all, I'll add a line that holds the OoferBucks Instance, to make the next line shorter and easier to understand:

local OoferBucks = player.Character.leaderstats.OoferBucks

Next, the correct way to add 1 to a value, is to set its value to itself + 1. Like this:

OoferBucks.Value = OoferBucks.Value + 1

So the final script would be:

local OoferBucks = player.Character.leaderstats.OoferBucks
OoferBucks.Value = OoferBucks.Value + 1

Hope this helps!

You would start of by making leaderstats

-- Normal script in ServerScriptService
game.Players.PlayerAdded:Connect(function(Player)

local Stats = Instance.new("Folder", Player)
Stats.Name = "leaderstats" -- The name most be leaderstats, or this would not work!

local Money = Instance.new("IntValue", Stats)
Money.Name = "Money"
Money.Value = 0

end)

So now, you would need another script inside the gui button, remember it should be a Local Script.

local Player = game.Players.LocalPlayer
local Stats = Player:WaitForChild("leaderstats")
local Money = Stats:WaitForChild("Money")

local UI = script.Parent -- UI is the ScreenGui
local Button = UI.Button

local Debounce = false -- this prevent from spamming the button!
Button.MouseButton1Click:Connect(function()
  if Debounce == false then
      Debounce = true

      Money.Value = Money.Value + 1

      wait(2) -- this is the amount of secounds you should wait before getting more money!

      Debounce = false
  end  
end)

Hope this helped you out, this is not FE Enabled!