Learning about Video - NLL455

NLL451 instructed to click on 'Embed'. I could not find it on a YouTube until I right clicked on the display. I used the video below:

A panel popped up and showed:

1. Copy video URL. It appeared after copying: https://youtu.be/W6NZfCO5SIk
2. Copy video URL at current time. Afer copying: https://youtu.be/W6NZfCO5SIk?t=2
3. Copy embed code is shown below Picture:
   
   
   

   The code popped up automatically; so I have to copy the code below in such a way that it is informational. As an experiment I changed the frame size to ¼ of what the default was. Note when I changed the 'frameborder' from 0 to 15 there was no change in appearance.
   

   <iframe width="764" height="430" src="https://www.youtube.com/embed/W6NZfCO5SIk" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen> </iframe>


4. Loop - I don't know its benefits.
5. Troubleshoot playback issue - Only when there is problem
6. Copy debug info - Only when there is problem
7. Stats for nerds
   
   

NLL457 lists six other video hosting services.