Marketing knowledge is the most needed knowledge in our current times. Anyone today can create a product – whether it is an ebook or something else, but if you cannot market your products you can stop producing products right from the start. And a sad truth is that even most professional entrepreneurs start their businesses without even a blind guess of how they will market their product. Coming from the startup scene and having connections to both European and US based startups I can tell you that it is the marketing side of things that breaks most startups (and not the development side of things like so many people believe).