The UEFA Champions League utilised to begin with a double round-robin group stage of 32 teams until finally it evolved into a league stage of 36 teams, and that is preceded by two qualification 'streams' for groups that don't receive direct entry into the Match good. A map of UEFA https://k-o-nh-c-i-8863950.kylieblog.com/37079034/what-are-the-uefa-champions-league-and-uefa-europa-league-no-further-a-mystery