Growing an e-commerce business often requires a broad set of skills. An online merchant may need to be equal parts bookkeeper, marketer, and developer. Fortunately many of the necessary skills can be developed online for little or no cost.
Here is a list of educational resources for online merchants. There are resources for specific subject areas, such as inbound marketing, coding, and mastering Google Analytics. There are also broad education sites, with many useful courses in business and technology, and many other topics.