In football (soccer) the Laws of the Game are the rules by which soccer is player. In contrast with other sports, the Laws of the Game are universal worldwide and across professional, collegiate, and youth soccer (with limited exceptions at lower age groups).
The Laws of the Game are defined by The International Football Association Board (IFAB).
The Laws are available in many ways:
To encourage the development of youth soccer, a series of modifications to the laws are enforced. You can read more about each modification here:
The Laws cover all aspects of the game, but sometimes it is helpful to referee to some summaries to manage the day-to-day.