When a player gets the ball, he needs to know how to play, and he needs to react instantly. When you face a defender, you must react immediately. Whether you have the ability to attack, what kind of offensive action you can make when attacking, whether to pass the ball or choose other options if you don't attack, these details can show a player's dealer.
When a player has no ball, all kinds of running positions also reflect his basketball IQ. For example, if you break the defense, you need to make room and mess it up, instead of squeezing with your teammates. If the opponent's defender marks people, as a player without the ball, he should pick more and roll more with or without the ball. These basic choices can only be made instantly if he has a certain basketball IQ.
To sum up, basketball IQ contains many conveniences, and it takes a long time and high-intensity training to understand and make an instant muscle reaction. So why are some athletes different from ordinary people? Basketball players' ball dealers have reached a certain level after long-term training, and their mutual transmission of the ball and some offensive choices are far higher than ordinary people. So basketball IQ is very important in basketball.