Hello and welcome to PSG.
I have a few observations, most of which are intended to help the presenter as well as any potential viewers.
The video is very basic and presented by an entry level user. There are several things presented in this video that need to be addressed.
While you did mange to add some written instruction, there are far too many moves that are made without explanation. Since the presenters version of Photoshop is NOT in English, these moves will be hard to understand.
When using transform, add the shift + option modifiers to transform around the center, this way, your not chasing your image all over the screen.
Never CUT anything, always use layer masks.
When using any tool like the Burn or Dodge Tool that alters the primary subject (ball) always work on a separate layer, this will allow you to make changes later if needed.
You did not explain how you made the extra layer for the table and not needed BG reflection, you just did it.
When making a selection, just Command/Control + click the layers thunmbnail, in this case the ball. You used the Magic Wand Tool, this may make undesired selections. This is where you should have used layer masking.
There are several aesthetic mistakes made. The ball would never be stationary at the angle it's depicted, it would roll off the table. The metal ball, as seen from the front view, would not reflect what was behind it, it would reflect what was in front of it. There may be some slight reflections of the background, but only in the very edges of the ball. There would be a gradient in the table top as well as some slight blur on the back edge of the table.
There are many other things I could address, but I will stop there.
All in all I would rate this video about 2 on a scale of 1 to 10, 1 being poor and 10 being excellent. I can appreciate the effort. You will need to practice and improve your skill level before your attempt another tutorial.