This is a good book to buy if you want to know more than the sun signs, but aren't sure where to start.
If you are familiar with Parker's Astrology, this book is by the same authors and is similiar to it, but it is smaller and on a more basic level than the former, which is good for somebody brand new to astrology.
Personally I prefer Parker's; it's more comprehensive--I don't want two books on my shelf that are so similiar. But like I said, this may be a great choice if you don't want to spend a lot of money and aren't sure if you are ready for the more detailed aspects of astrology.