I have a basic understanding of the MLS and the structure of American professional sports (NHL, NFL, MLB), but the structure of football seems to complicated to follow.
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Your confusion might be that (NFL, NBA, MLB) play different sports, so they seem more “different”.
FIFA does the World Cup and the Olympics, competition between national teams.
Union of European Football Associations (UEFA) does the Champions League, an annual competition between top-division pro teams in Europe. There are similar organizations for other geographic regions (called confederations): CONCACAF, CONMEBOL, CAF, AFC, OFC.
Then there is the English Premier League, German Bundesliga, French Ligue 1, Dutch Eredivisie, MLS and oodles of other national soccer leagues.
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