Designing Your Product Line

This is a high quality course containing over 35 minutes of lessons about designing your products line and improve your sales, 

Product lines are created as a marketing strategy to keep customers who are already buying from you. The operating principle is that buyers are more likely to respond positively to brands they know and love and will be willing to buy the new products based on their positive experiences with the brand in the past.

For example, an online business that's already selling a (software, ebooks, DFY services) might launch a new product version under the same brand name but with different features.