There’s a realization that every freelance designer must go through at some point: client work isn’t enough to ensure your long-term financial security. What if you get sick? What if you can’t find clients? What if you want to take a vacation?
One possible answer to this problem is earning passive income — i.e. selling products or services instead of selling your own time. A common way to do this is to sell digital goods such as eBooks, PSD templates, WordPress themes, icons, and so on.