RSS for Desktops
Safari: This browser is unable to display RSS feeds; however, you can search the App store for extensions to manage RSS feeds.
Firefox: As of December 2018, Firefox's built-in feed reader and Live Bookmarks were removed, starting with Firefox version 64. For alternatives, see Feed reader replacements for Firefox.
Chrome: There is no built in RSS feed reader but you can use a Chrome RSS feed reader extension like this one offered by Feeder.
Outlook: You can add RSS feeds to your Outlook Mail account using these instructions.
RSS for Mobile Devices
Search the Apple App Store or Android Apps on Google Play for RSS readers.