A Field Goal in basketball refers to any shot taken that makes it into the basket, excluding free-throw attempts.
Field goals are worth two or three points, depending on where they were attempted from on the court.
In your league's scoring settings, you'll see these three options regarding Field Goals:
Field Goals Made refers to the number of shots a player successfully made, excluding free throws
Field Goals Attempted refers to the number of shots a player took regardless of whether they made it or not. These also exclude any free throws.
Field Goals Missed refers to the number of two-point and three-point shots that a player did not make.