Why not start with Judaism 101,” located at
http://www.jewfaq.org/
It’s organized in a user-friendly format by topic and by Basic, Intermediate, and Advanced levels. Sample topics include “Movements of Judaism” (Basic) and “A List of the 613 Commandments” (Advanced).

A long-time online standby is the “Frequently Asked Questions” provided by the newsgroup soc.culture.jewish. The web site is at
http://www.shamash.org/lists/scj-faq/HTML/
and while a little more awkward to use than Judaism 101, it also has reading lists for further study. **Note that both sites have been compiled by mainstream Jews and reflect those viewpoints. We are not advocating non-Christian views, but want to provide readers who care about Jewish people opportunities to increase their understanding.