Highlander, a form of 9v9, is the largest competitive Team Fortress format. Its similarities to average public servers make it an ideal starting point for new players, and its requirement that each team has one of every class ensures a spot on the team for players maining any given class.
Highlander Competitive Format
Highlander is a competitive format with nine players on a team, each representing a different class. The name of the format comes from the quote "There can only be one [of each class]" from Highlander, a movie released in 1986.
Payload and Attack/Defend maps are played using a stopwatch format, where teams alternate between attacking and defending after each round. The team that captures more points on offence wins. Should both teams capture the same number of points, the team that does so in a shorter duration wins.
Main Article: KOTH
In a King of The Hill map, there is one central point on the map. Each team must try to capture that point. When one team does capture the point, their 3:00 timer will begin to time down. When the other team captures the point, the other team's timer stops and their timer starts to tick down. The first team whose clock reaches 0 wins the round. It is important to note that if the point has capture progress on it when one team's timer reaches 0, the game will go into overtime, where the defending team must wait for the capture progress to reverse fully or the attacking team must capture the point to continue ticking down their own timer.
Main Article: 5CP
5CP maps involve both teams trying to capture all 5 control points to win a round. Capping the midpoint results in the winning team getting a forward spawn that allows the rest of the team to attack the next point quicker, and likewise for the fourth point. In Highlander, 5CP maps usually receive negative feedback due to stalemate situations that can last for an extensive amount of time. For example, on Gullywash, when either team is unable to gain any significant advantage when trying to push forth, a typical three-four stalemate is seen where both teams play behind choke, waiting for the other to make a move.
Over time the community has written a handful of guides on how to play this popular format, some of them can be seen below: