When you create a blog post it is included in an RSS feed for the blog.

The address is yourwebsite.com/blog/feed (where yourwebsite.com is YOUR domain - this is just an example).
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When you copy that address, and paste it into an RSS reader such as Feedly, Inoreader, feeder, (there are many readers) the posts will appear.

NOTE: If you click on a feed URL (yourwebsite.com/blog/feed) you may get a screen with code it on. THIS IS NORMAL. Feeds are not mean for humans. Feeds are meant to be copied and pasted into apps.

To better understand how RSS works, here is a quick tutorial on feedly.