As defined by WikipediaWikipedia, RSS (acronymic for Really Simple Syndication) is "a group of XML based web-content distribution and republication (Web syndication) formats primarily used by news sites and weblogs (blogs)." Essentially, an RSS feed is a hosted XML file from which your RSS newsreader pulls headlines, URLs, and other content as it is updated.
To get started, you'll need to download and install a free RSS newsreader client. Many are available (some as browser extensions); see Google's list hereGoogle's list of RSS client software.. Point your software to RSS feeds of interest, and you're done!
Not too much at this point to be perfectly honest. The goal is to give updates when there is new software releases / updates. New projects started / released. There are a number of ways of getting the RSS: