[Damian]

On calls like this, look for advadtage/disadvantage. For example a guard out past the top of the key with no one closely guarding him my be dribbling with a slight carry.

However, some guards will try to change the direction of the ball while dribbling it when being guarded. If the ball rests in his palm, it is illegal.

Some of these summer sports like And One have really made this more difficult as now players are seeing this on the tele and see an official watching and not calling some very obvious calls. At the begining of the season it might be a good idea to review this with the captains during the pregame.

Best of luck with your season and welcome to the forum. There are a lot of really good people here with a lot of experience. Don't be afraid to respond to something and be wrong. They will correct you and you will learn from it. I know I have.