There are literally thousands of ebooks and books available about buying and selling on Ebay. When you are purchasing Ebay information products, your goal is to learn something from every ebook, video or audio that you purchase.
Most information products offer you a 60 day or more money back guarantee. In all of my years on the internet, I have only returned three or four products because I felt that they provided no real direction. The majority of them, I keep. I also feel a bit obligated if I used any of their suggestions from their material to be honest about it and not ask for a refund. Just about every publication you order will offer something new. If it doesn't, then send it back.
There is NO magic potion that will make you an ebay powerseller or ebay seller overnight. In fact, it may take years to build a business that supports you. The only exception to that is for the person who has money to spend on inventory up front or a major corporation that already exists. Those types of individuals can start up quickly and earn lots of money on Ebay.
You will need to read many types of books on buying ebay information products. You will need information on how to set up your ebay business to attract buyers, how to make your pictures more appealing, how to build lists of potential buyers, how to set up your ebay store and much more. A lot of this information is free on the internet, but it's also very time consuming to find it. When someone has taken the time to compile the information, it's well worth the money. I often equate it to how much my time is worth per hour vs doing the research for something.