RSS stands for Really Simple Syndication. A RSS feed is a family of web feed formats used to publish frequently updated works—such as blog entries, news headlines, audio, and video—in a standardized format. People subscribe to RSS feeds to be kept informed on a subject topic, blog, organization, etc.
You have two basic choices regarding to RSS: (a) use a blog that has built-in RSS feed technology, as WordPress has, or (b) create the RSS feed from scratch using an XML file. You will be using the RSS feeds provided by WordPress connected to the blog you created in the project step 2.
Please read May chapter 3 for a detailed coverage of RSS Readers, Feed Widgets , and how to create RSS feeds. Be careful when you read this chapter because parts of it only apply to sites hosted on a paid Web server provider. For example permalinks only work in the private hosted blogs, NOT in the free ones you are creating in the WordPress site.
WordPress automatically creates feeds in your blog, but you will need to make them easily available for others to subscribe, follow your postings. You will use the Dashboard to add a widget to the side bar of your blog. Most browsers automatically recognize the feeds and create special live bookmarks to them. I suggest that you use Feedly to test the subscription to your blog RSS feed. Read the instructions for the project step 3 on how to add a RSS feed widget to your blog in WordPress.