Playing videos from various online sites either in VLC or Potplayer?

I know you can open youtube videos. I am asking about most sites or at least a number of sites I frequent.
I like my “home” player. It behaves just how I set it up

What is this process even called? I’ve tried streaming but keeps giving me results for streaming videos that are on ones drive to others.

if anyone can point me in the right direction, it would be appreciated.

Thanks