1. Pay attention and stay focused on the task at hand, no distractions, including radios, telephones, TVs or attractive nuisances or good lookin' women.
2. Murphy's Law says if something can go wrong, IE fall, slip, twist, bind, catch, stop, lift, break off, etc...it will. Prepare for that to happen and you lessen the chances. Turn off the machine before reaching for loose pieces. The bandsaw is an exception if you knock the loose piece from the back of the blade clear to the front with a scrap stick, my exception (low risk operation) only, you're on your own.
3. The Law of Gravity, states that an object in free fall accelerates at the rate of 32 ft per sec per sec. or maybe that was Newton's law I donno, but once gravity takes over there's not much left to do but wait, cover your face, prepare for the coming crash/fall etc. Example:Do not attempt catch a loose piece over a running blade.
Better to be hit by it than lose any fingers, the lesser of 2 evils here.
This has gotten me through 67 years of life relatively safely
"Common sense" is an interesting term but hard to define specifically.
The above rules are all common sense to some, but not others.