Head-to-Head (H2H) is a scoring system in which you compete each gameweek directly against another manager in your fantasy league. The manager with the most fantasy points receives the win.
A head-to-head win can be awarded in different ways. That usually depends on the sport.
In fantasy American football a win is added as a win to your seasonal win-loss record. The teams with the best records advance to the play-offs. The seeding is determined based on these regular season records. Winners of each head-to-head play-off matchup advance to the next round.
In fantasy football a win might be worth 3 points, a draw 1 point and a loss 0 points, just like in real-life. The manager with the most points at the end of the season wins the league.