Encyclopedias and other reference sources can help you learn the basic issues about an important topic before you decide how to narrow down your research question.
Most important encyclopedia on religion -- a great place to start. Also available in print in Daley Library, on 2nd floor reference section: BL31 .E46 2005
Xystematically represents the history and culture of Eastern European Jews from their first settlement in the region to the present day. Covers religion, folklore, politics, art, music, theater, language and literature, places, organizations, intellectual movements, and important figures. 2 vols.