Know how to solder, properly.
I've learned that in electronics class.
Edit: I have not read the entire list but everyone, who drives a vehicle, needs to know how to change a battery, add water to a maintenance battery, clean battery post and connectors, change battery cables or connectors, change the alternator, check and inflate tires (once every two months) and know the correct p.s.i., properly check and top off the fluids with the right fluids.
Jeanette Isabelle