Actually, there are many. Let's talk about some hidden rules when playing. For example, if the opponent doesn't let the main player play in the game, we won't let the main player play. Also, the winner should not hold the ball and score in the last few seconds of the game, because if so, it will be regarded as a sign of disrespect for the opponent and should hold the ball until the end of the game.

And the so-called star whistle. In fact, when attacking, if the player is not a star or is not well-known, the referee will directly blow when the opposing player has obvious foul actions, but the star is different. If the opponent is steals the ball and the great dunk player, he will choose not to whistle because of the beauty of the game.

In addition, although it looks fair in the NBA, there are still some differences between home and away games. It is not difficult to find that the general penalty at home will be more inclined to the home team. In fact, it is difficult for the referee to be so absolutely fair because of personal factors. How to punish generally depends on how the referee chooses the penalty scale.

In addition, in the NBA, the average rookie should do some services for the old players, and sometimes the old players like to play tricks on the rookie. Actually, I definitely have some unwritten rules about sports. Some of these rules are designed to play tricks on others, but some are also out of the overall appreciation of the game and the competitive spirit of "friendship first, competition second", so they are still very interesting.