Why does Chelsea win the championship and Tottenham can only play the Europa League? What are the quota allocation rules?

Because Chelsea can directly participate in the next Champions League competition as the champion, and UEFA only gives the Premier League four Champions League places, which should have been the top four teams in the Premier League, but now Chelsea has automatically obtained a place, so only the top three teams in the Premier League can join, and Tottenham, as the fourth team in the Premier League, can only participate in the Europa League.

Not only can Chelsea benefit from it, but both Real Madrid in 2002 and Liverpool in 2005 failed to meet the league ranking requirements, but both participated in the Champions League as champions. However, in the 2005-2006 season, five teams in the Premier League participated in the Champions League (champion Liverpool and the top four in the Premier League), with more than four places. Therefore, in 2005, UEFA made a formal provision: in similar situations, champions can participate in next season's competition as defending champions, regardless of their domestic league results.