So if your probably on this site you probably already know the basic rules like that you can't use your hands and that a team only has 3 substitutes to use per game.But the hardest rule to explain and understand is the offside rule.So the offside rule states that a player can't passed the ball to their teammate if they are passed the opossing sides last defender.
There is also the new and improved use of VAR which stands for video assistant referee which is suppose to be used to allow for the rules of the games too be enforced by using cameras to help the referee make final decisions, like if a tackle or foul should result in a penalty kicks and freekicks