Every collection you create has a separate RSS feed, and your portfolio has an RSS feed as well.
You can access it by going to the collection via authory.com/app/collections or by going to your portfolio section at authory.com/app/portfolio and clicking the "Settings" menu in the top bar, then selecting "Create RSS feed":
The RSS feed shows the first 20 pieces of your Collection/Portfolio by default. It consists of the following information:
Headline
Description
Date
Preview picture
URL
Whether the URL links to the content piece at its original source or to the copy in your Authory account depends on the Sharing settings that you’ve set.