In essentially every scenario the following decides the order in the standings:
1) Most wins
2) Best strength of victory
For example, player A and B end the season tied. Player A has 0 losses and an SOV of 100, and player B has one loss and an SOV of 110. Player A is the winner. If Player A and B both have one loss, then player B would be the winner because of their higher SOV.
If All players lose in a given week: Two things can happen, depending on the league "No Survivors Tie-breaker" setting. If Last Man Standing is configured, and its not the last week of the season (as configured by the league manager) all players alive at the beginning of the week are given a new life and move forward to the following week. If the configuration is Strength of Victory, the player with the highest SOV is the winner.
2nd place bracket leagues: The same tie-breaker rules above apply to each bracket. However, the Last Man Standing option is only applicable to the 1st place bracket. That is, players in the 2nd place bracket are not moved forward if they all lose. Note that if Strength of Victory is the "No Survivors Tie-breaker" configuration, and everyone in the 1st place bracket loses, the winner is the player who began the week in the 1st place bracket and ends with the highest SOV. The 2nd place winner goes to whoever is left with the highest SOV, regardless if they began the week in the 1st or 2nd place bracket.