According to Google, there are at least 160 English accents. So, I don't think you need to know all of them. I suggest try googling the ones you're interested in.

There are far too many to list. But you may be interested in watching this YouTube series with the dialect coach and “accent expert” Erik Singer. You can hear many examples of different English accents. Some of these videos are solely focused on American English, but not all. In some, he critiques accents in movies and television. https://youtube.com/playlist?list=PLLZmcylyrIYr9OmcPVhXsjE0XqJrJEDbf&si=2Dau-vmZqe1E7IuX