I found the Lean Startup by Eric Ries to be useful in helping me focus my efforts. Also, Made to Stick: Why Some Ideas Survive and Others Die, by Chip and Dan

I found the Lean Startup by Eric Ries to be useful in helping me focus my efforts. Also, Made to Stick: Why Some Ideas Survive and Others Die, by Chip and Dan Heath. This helped create more effective and compelling content. It's very high-level though.