C - It is the command used for making a circle in AutoCAD.
PL - This command can be used to make a Polyline in your drawing.
REC- This command will make a rectangle in AutoCAD.
ARC - As the name suggests, this command can be used to make an arc in AutoCAD.
CO - This command is used to copy object(s) in AutoCAD.
TR - This command is used for trimming a geometry.