Welcome Green Potato! Hope you will learn a lot here, starting with the different signs of the Zodiac of which Capricorn is one of 12. Ruler of Capricorn
. It is Saturn.
I am sure you MUST have heard about Capricorns! Those are the ones born between the 22th of December and 20 January.
You can find all information about the basics of astrology when you go to Forum Jump (bottom of this page) and go to the Education Board. Loads of links and info.