In other words, they tell what types are supposed to be used with certain types of meat; they tell how to “sample” a wine and what to look for in terms of flavor; purchasing information or recommendations.
This is the about.com wine guide; it is probably the best beginner resource on wine on the internet:
http://wine.about.com/od/winebasic1/
Wine Spectator has a couple of courses available.
Look under the Learn about wine tab.
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wine.com has some good resources.