The 22 immutable laws of marketing by Al Ries and Jack Trout. Software is ultimately for humans. Understanding products, marketing and selling help you build be

The 22 immutable laws of marketing by Al Ries and Jack Trout. Software is ultimately for humans. Understanding products, marketing and selling help you build better tools for humans and see how products (be it open source, programming languages, retail products, etc) work in the marketplace and not run down paths of "well this is the most popular they must be the best" ... Solid marketing foundations are probably one of the more important skills that separate the good from the great practitioners. Everything else on this thread I've read isn't a weekend. It's a careful study.