you got me on this one! Possibly choice and types of blades including spirals of blades ,blade care do's and don'ts with blades and all the things that you can say about blades, don't touch the ends of them .Enlarging patterns, finding patterns ,adhering patterns ,removing patterns ,backing up with scrap wood before drilling, correct teeth per thickness of wood ,blades , removing patterns .going only as close to another cut out on the pattern as you skills are capable of, doing the most critical spots first so if you mess up starting over won't be a great loss , machine speed ,pushing and pulling speeds ,proper lighting ,foot control, machine angle for best viewing of cutting process , color of patterns for ease of seeing where the blade is (Lt. gray.)fate of inhaling dust, dust collection ,sitting or standing scrolling, that's a start ! but you knew all this to talk about anyway . This sounds like a fun thing to talk about as with your experience no question goes un answered!