How do I make a gui that appears only the first time you join the game?

I just know the very basics of Lua since I didnt studied much this language. And what I was trying to do is to make a gui pop up in your screen only the first time you join the game. Dying or rejoining the game wouldnt trigger the gui to pop-up. It seems like the code reset when I die or I leave the game

I know my code sucks please dont judge

local no2x = 0  	-- Variable to not allow the gui pop-up again
local Frame = script.Parent.Welcome 	-- The gui
local Button = script.Parent.Button		-- The close button

if no2x == 0 then			-- Code to execute if "no2x" is 0
	Frame.Visible = true
	Button.Visible = true
else if no2x == 1 then		-- Code if "no2x" isnt 0
		Frame.Visible = false
		Button.Visible = false
		
		if no2x == 1 then		-- Output to see if the code is working
			print("no2x set to 1")
			
			Button.MouseButton1Click:Connect(function()
				no2x = 1		-- Set "no2x" to 1 when the button is clicked
			end)
		end
	end
end

I added the commentaries while writing this to make it easier to understand the code. Anyways if you know the fix for this crappy code I would thank you so much! Thanks for reading.

To make the Gui not popup after you join you have to use DataStoreService

You also had some errors in your script but I fixed them. :)

local no2x = 0      -- Variable to not allow the gui pop-up again
local Frame = script.Parent.Welcome     -- The gui
local Button = script.Parent.Button     -- The close button
local DSS = game:GetService("DataStoreService"):GetDataStore("SaveGuiScreen")

while true do
	if no2x == 0 then           -- Code to execute if "no2x" is 0
		Frame.Visible = true
		Button.Visible = true
	end
	
	if no2x == 1 then -- Code if "no2x" isn't 0
		Frame.Visible = false
		Button.Visible = false
	end
	
	if no2x == 1 then       -- Output to see if the code is working
		 print("no2x set to 1")
	end
	
	Button.MouseButton1Click:Connect(function()
	       no2x = 1        -- Set "no2x" to 1 when the button is clicked
	end)
	
	Player.PlayerRemoving:Connect(function()
		DSS:SetAsync(Frame, Frame.Visible)
	end)
end

I hope this helps! Please tell me if I made any errors :)