Here are three great websites to help you get answers and information about what we believe as Catholics:
1) www.catholic.com
This website explains and defends the Catholic faith. You can type in virtually any Catholic topic in the search box.
2) www.strangenotions.com
This website tracks ongoing conversations between Catholics and atheists.
3) www.wordonfire.org
This website has all kinds of useful information developed by Bishop Robert Baron and his colleagues.