I'm following you, but I find it very difficult at that point. When you arrange all the cubes accordingly, and my touchpad right-click doesn’t undo like you said in the video too.
Hi Ismail, yes, it is difficult, there is a lot of information you need to process. There is nothing wrong with watching a Lesson (or even a Course) more than once. Also, some things will become clear later on, don't worry if you don't understand everything at once.
Right-Click doesn't really Undo like CTRL+Z; when you are in the middle of using a Tool, it Cancels what you did.
So, let's say you start Moving the Default Cube with G, then Right-Click or Escape will stop the Move Tool and put the Cube back to where it was before you started to Move it.
When you Move the Cube and then press Enter (to confirm the Movement), You can Right-Click as much as you want, but the Cube won't jump back. The Movement has been confirmed by you and you are no longer using the Move Tool, so there is nothing to Cancel. You can still Undo the action, with CTRL+Z.
Keep practicing!
I didn't know you could right click to cancel the same as escape. Useful to know!