An Ebook is a book, but rather that a paper book it is in electronic form say on a computer.
You can buy thousands of ebooks with resell rights for a few pounds or dollars. Wow you might think to yourself I can make fortune selling these individually, and yes maybe few people in the entire world do make a lot of money but it is unlikely to be you.
Have a look on ebay, search for who sells ebooks look at their feedback how many ebooks do they actually sell? How many of them do they not? How much do they sell them for. You can automate the system for selling these products but it really isn’t worth it.
There are too many people selling too many of the same item, if you wrote your own ebook, maybe had it reviewed it might sell quite well but selling ebooks for a quick buck won’t.
Most of these freebie ebooks are not high quality and are there to sell their own product.
How to make a quick buck it is not.
Do some more research in this area if you wish I am sure you will agree with my conclusion.