Have you searched on the forum first?
"The Offset UDim2 value will stay with the same amount of pixels, no matter what screen they’re being viewed on.
Scale is based on percentages, a “0.5” Size value will take up half of the screen (0.5 = 50%).
To ensure that your UI scales properly across every device, make sure that the offset property is set to 0. However, if you would like to get technical, a mix of Scale and Offset would work just as well.
As an end product, your UI should scale properly -"