So, you take a stick, and you use it to poke things with. Move the end in your hand, and the far end moves apparently at the same time. You can use a long stick to tap out a message, eg on a high window.
Now just suppose you had a very long stick. One end is on Earth, the other end is at Proxima Centuri, 4.22 light years away. It is, of course, made of that wonderful substance unobtanium which has the properties of being super light, so the entire stick only weighs 1 kg and super strong, so the stick dfoesn’t bend or break. So, you push and pull the near end of the stick, tapping out a message in Morse Code. What happens to the far end? Since we know that information cannot travel faster than light, the far end can’t move, can it? Or does it?
So, what exactly happens to the stick during those years? does the stick compress, then expand 4.22 years later? Does the stick stay still when you push it, then move 4.22 years later, or what?