I highly recommend watching this 4:04 minute video explaining what Astrology is all about.  

Excellent!

The voice sounds computer generated & speaks rapidly, but nevertheless, you will learn a whole bunch or get a refresher of what you think you know.   I like using cards in the Astrological wheel layout.  Not only are you reading the cards but you are also reading the cards in the houses which have their own unique representations.

Additional valuable information describing polarities. 4:31 minutes.