The webpage for this course has RSS2.0 and Atom feeds. Click on one of the icons in the top left corner to subscribe (make sure that you are on a page relating to this course when you do so, otherwise you may get the feed for the entire site by mistake). The latest versions of the main browsers support feeds (sometimes called Live Bookmarks) or you can find a good free feed reader for your computer. It is probably best to get one that detects when an entry has been updated (rather than just one that looks for new entries).