Etsy Seller Handbook a big help for sellers and makers Answered
Etsy has compiled all of their how-tos for selling goods in one place. Whether you're planning on selling goods on Etsy or elsewhere or not at all there's loads of good information in here.
Many of the how-tos are helpful for those who are documenting their projects on Instructables. Here are a few examples:
Feature Friendly Photos
Brighten Your Photos
Writing for an online audience
Etsy's Seller Handbook