how to make something invisible after you wait a few seconds?

You can use a wait() function to delay the script for x amount of seconds. For example,

wait(3) -- Number of seconds for the delay
script.Parent.Visible = false -- Sets the visibility of the UI that the script is attached to as false

Use the wait() function and change the amount of time in the wait function. (I’m replying to your little brother momgggbghghghghg)

brick.Anchored = true -- just to make sure the brick is anchored
wait(4) -- the delay
script.Parent.Transparency = 1 -- part transparency, to make a GUI Invisible, make it Visible.

script.Parent.CanCollide = false -- delete this line if you don’t want this brick to be go though