Futsal
The importance of futsal are the rules. There is a 6 second rules on the goalkeeper if they hold it longer it is a foul called on the goalkeeper. I will add the importance of no throw ins you have to set the ball on the floor and play. Free-kicks have to be 2 touch and the wall has to be 2 feet or 3 feet away The goalkeeper punts are not allowed in futsal , It is a closed area or open with a net or ceiling on top. Soccer and futsal are very different. Soccer is a sport that is played on a way bigger pitch with 10 players (110 by 100m long and 75 by 64 m wide) and it has different motion throughout the game like how the ball moves fast , slow you may never know. Futsal has about 5-6 players and the pitch is 3x smaller than a soccer pitch and it is about  (25 - 42 m long 16 - 20 m wide).  There are no slide tackles or else the is a foul called on you. Their is headers available but futsal is usually played fast and on the floor. If the ball touches the top net or ceiling it is the other teams ball.