[SOLVED] How do I make an efficient timer? (2 decimals)

Hello!

I would like to make a timer with 2 decimals, surely I can do this:

local gui = game.Players.PlayerGui.Timer.Frame.TextLabel.Text
for timer = 1,math.huge,0.01 do
	wait(0.01)
	gui = timer
end

But is there a more efficient way to do it? I seen people talking about Hearbeat but I don't quite understand how that works Thx for your time and all answers are appreciated!!

well, guess i managed to find out how after 7 months