I've been working in the pizza restaurant industry for 20+ years now.  Owned and operated my own store for 15 years.  I currently still own and operate it.  Bought another location at one point, owned that for about 6 years and sold it.
I've handled payroll, POS systems, advertising, food supplier relations, employee management, hiring, terminating, repairs, quality control, budgeting, and a lot more.