Holes are just lack of electrons, but electrons in motion still carry the current. Holes weren't really discussed until solid state electronics as far as I can remember. But I'm only 67.
Holes do move in the opposite direction from electrons, and electrons move from negative to positive. O'le Ben Franklin didn't know about electrons and he picked positive and negative some 250 years ago, wrong.
Holes are the predominant current in a metal lattice that's short on electrons to fill the outer orbits. Electrons are the predominant current in a metal lattice that has a surplus of electrons.
Calculations work for both holes (positive particles assumed by Franklin) and electrons, just can be confusing to those with inadequate backgrounds trying to understand electron tubes and semiconductors.
Ohms law and other electrical circuit laws apply to either selected current flow and any location for the ground in a circuit, if any.
Tractors run with positive or negative ground so long as all the accessories are set for the same polarity when they are polarity sensitive like and alternator, a radio, a planter monitor, or a JD gas gauge. Coils have a preferred polarity for better spark at the plug, not hard to adjust the coil primary connections for that.
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Today's Featured Article - Tractor Implements and Their Use - by Curtis Von Fange. Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he reached his early sixties
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