This 2013 edition of How to Choose Which Digital Files to Sell will help and guide you on how to make money online by selling digital files. 
Writers are often given the advice to “write what you know.” Similar advice fits when choosing which types of digital files you will sell. Sell what you know! 
This eBook talks about photography, music, knitting patterns, recipes, D.I.Y, fiction and graphic arts
The more you know about a product the easier it will be for you to sell it; you’ll be more enthusiastic about promoting a product you know something about. This book should give you some ideas regarding different types of digital files that are being sold and by whom.