A three-point shot in basketball is when a player shoots behind the three-point line.
As the name would describe it if the player makes the shot it’s worth 3 points.
The scoring settings for 3-pointers are found under League Settings -> Scoring.
A missed shot is when the ball bounces over the backboard or touches a guidewire or support of the backboard.
A shot attempt is when the ball leaves the player's hands and travels towards the basket. It is not required that the ball touch any part of the basketball hoop, including the rim or backboard.