MS Windows, Surface, PC computers, phones, Xbox, cash points & tills appreciation

Windows 10

problem:

• stuck in a spinning circle of dots
  
• on one occasion was told error = unmountable boot volume
  
• after that tried the steps on this tutorial:
  https://youtu.be/q4rp--5xWSg
  
  
  

However, in the command menu(?) I went through all the steps, until 18:23

after hitting "A" at 18:36 he says; "you should be good to go" - does this mean it will do something, because nothing happens?

Or is the idea of this that you then use this copy to boot from, in which case how?

Cheers.

ps Any other guides would be appreciated.