In the World Cup, after extra time and penalty shootout, the two teams are still tied in the knockout stage. What should I do?

/kloc-after 0/20 minutes of draw, penalty kick is the most direct and cruel way to play. It has only one purpose, that is, one side wins and there is no penalty draw. When the top five players are still tied after the penalty kick, each player will take turns to take the penalty kick until the outcome is decided. If all the players on the field (except the players sent off and the wounded) have been punished, the punishment will be repeated in a cycle.

This is the basic knowledge of football match, and it is also the most basic knowledge as a referee.