I Know How GuiMove() Works, But How Does GuiSize() Work?

Thank you for looking at my question.

GuiMove()

GuiMove() is actually making a ScreenGui move or anything a child of its.

But How Would Changing The Size Work?

I would like to have the Gui or any of it's children resized instead of being able to move, here's an example of GuiMove() code, to have you guys tamper with for GuiSize()

local HasPressedPlay = false

function PlayGame()
if HasPressedPlay == false then
       for GuiMove 1, 30 do
          if GuiMove <= 30 then
           --Code for moving not gonna lets some peoples a copy
end
--repeated code

So....

You guys know how to do this, but make the Gui resized instead? Thanks!