What is the difference between the football premier, champion and Europa Leagues?

premier league showcases the best english teams and man united r at the top they won the season last week the champion league showcases the best teams in europe but they had qualifiers which has been watered down to the finals madrid vs united they'res no top theyre is just a winner and the europa league is less significant than the champions league but showcases best of europe also. they give opportunities to lesser clubs from the non footballing capitals around the world and porto already won on aggregate