By the end of this year, Forrester Research Inc. expects US e-commerce sales to reach an impressive $334 billion. For perspective, that's 10% of all retail sales in the US.

And it doesn't stop there. By 2019, Forrester estimates that online retail sales will grow to $480 billion. So how do you make sure your e-commerce sales follow a similar trajectory?

Read the full Forrester forecast to find out:

• Which three categories together account for one-third of online sales
• Which categories will drive future growth
• What you need to do to stay focused on profitability
• And more