An RSS feed is typically enclosed in an xml file. Using the RSS Feed asset the content of the xml file will be displayed dynamically.
To add RSS feed to your library guides, follow the instructions provided by Spingshare
You can find a list of RSS feed URLs on this page.
In the case of the Library's new titles lists, users may encounter an error message if the above widget is used. You can add text to advise users not to click on the "website" link at the bottom of your RSS feed widget.
Alternatively, insert the RSS feed (an URL that ends with .xml) as a Link asset with the RSS icon. You may also want to provide users with additional information about how to subscribe to RSS feeds.