Used Car Inspection - Pre Purchase Inspection First
you could post the mfg, model #, and software version # of scanner AutoZone used for diagnostic test. Alternator and battery tests are purely analog. Please take car to local reputable local independent shop for diagnosis and repair including if you have to have it towed there. Obviously the knowledge to fix car is well beyond your current comprehension of how the systems work with each other.
If you don't need car for some time, this forum may be able to help you figure out yourself over much time the way you describe.
Probably more important: What do you do to earn money to pay for a good autos mechanic?