i'm trying to make moving platforms ride able so i don't fall of how do i do that this is my script?

while true do wait(0.1) for i= 1, 200 do script.Parent.CFrame = script.Parent.CFrame * CFrame.new(0, 0, 0.3) wait() end wait(3) for i= 1, 200 do script.Parent.CFrame = script.Parent.CFrame * CFrame.new(0, 0, -0.3) wait() end end