Fantasy football leagues generally play what is called a head-to-head format. This simply means that two teams in the league match up against one another each week, with the winner getting credit for a victory and the loser taking a defeat. Records are tracked and standings work just like they would in regular football. At the end of the season, some leagues have their own playoffs, pitting the top six or eight teams against one another in a bracketed tournament to determine the champion. So, like in real life, the best team during the regular season may not end up being the league champion.
There are other idiosyncrasies to watch for in each individual league. For example, as the end of the season approaches, some fantasy leagues will have their season end before the actual NFL season ends. Why, you ask? Well, as the NFL season heads into weeks 16 and 17, often the playoff picture is already determined, and many teams will begin to rest their regular players (which are the players who are selected in fantasy leagues) and play younger players. It is more fair for the outcome to be based on the players you originally chose, and if you have many players whose teams have already locked up a playoff spot late in the season, this could hurt your fantasy team’s performance.