First, there is an rss feed for the whole site. All articles are included here and this is perhaps the best option for getting notified whenever something new is published.
RSS feed for the whole site

There are also RSS feeds for every category for those with more specific interests.
RSS feed for the blog
RSS feed for the beginner category
RSS feed for the intermediate category
RSS feed for the advanced category

All feeds are in the RSS 2.0 format so your feed reader should not have any problems with it.