Nobody really knows anything about online marketing. If it was an exact art there wouldn't be hundreds of thousands trying to figure it out on a daily basis. It's mostly high levels of analytical thinking, a bit of luck, the ability to spot trends, and no fear of trying the unconventional. It's always changing.
you cannot count the knowledge in numbers.. it is all about experience. The more time you spend on forums, blogs and various sites the more you learn.. short simple answer to the lengthy journey
I was kicking ass in the online pharmacy business before I closed it down and now I realize that the fitness business is a totally different animal and I don't know jack sh*t... thus I'm here to learn...
I think the hardest thing about trying to learn from real (print) books is they take so long to get onto the shelves, most of the content becomes outdated quickly, and becomes irrelevant.
The problem, or the fun part, of online marketing is that it changes all the time. I know the principles of how to become successful, but you need to stay updated, and that's the really hard part So, I know some, but I am eager to learn more... Jens