Have you heard all the stories about people earning quite comfortable full time livings from eBay.  Want to join them and make money selling on eBay yourself?   Then be prepared to spend some time getting educated. 

For example, you’re not just allowed to get behind the wheel and drive a car.  No, while you probably didn’t actually get behind the until you were around the age of 15, learning to drive by watching actually started at young age. 

So why do people assume that learning to run an eBay business is something that can be done by anyone with an eBay account and some stuff to sell?

I wish I knew, but if you want to substantially increase your odds of actually being in business a year from now on eBay, then you will take the time to invest in your education.