Wow never thought the time would come to back up engaged in what he is saying, but engaged is right.
To put it simple if you have learned more in this eBook then other places, it means one of two things, your a complete newbie who is just starting out and hasen't made anything really work yet or you've become so twisted in the web of lies spread by the eBook Guru's.
Not all eBooks on these topics are crap, however 90% or more of them are just recycled garbage left over from the years past. Will it help someone new to the industry? Yes and NO.
Yes it will help them with some of the terms, it will help them get introduced to a few areas but lots of them will follow the seductive lines in the books, they'll try some things out but since the information was only introductory lots end up fucking things up along the way, then they'll think ok well I just need another eBook to buy, then they'll waste a few hundred bucks and get the same result, sweet fuck all.
The high majority of people give up after this and begin to say how shitty this industry is and only scammers can make money by doing this type of thing, then all the newbies begin to think well hey if they can make money doing it why can't I, they take that same old shit information, create their own little eBook with a twist (hot chicks on the cover or re-typed), and try to sell it to more people.