Explain the Key Rules and Etiquette of a Sport You Are New To

Joining a new sport and not knowing the etiquette is worse than not knowing the rules. This covers both: the objective, the rules most beginners break without knowing they exist, the unwritten expectations, and what marks out someone who has only just started. Enough to not be the person nobody wants to play with.

Explain the key rules and unwritten etiquette of {SPORT_NAME} for someone who is new to participating.

Cover:
1. The objective: what you are trying to do and how you win or score
2. The three or four rules a new participant is most likely to break without knowing
3. The unwritten etiquette: what experienced players expect that is not in the official rules
4. One thing that marks out a complete beginner and how to avoid it in the first few sessions

Assume they understand general concepts of sport and competition but have no specific knowledge of this sport.