See Place:Germany for more general information.
I can't read German!
When researching in Germany you will come across FHLC abbreviations:
Common words to know
These records can help researchers find the home town and emigration dates of their ancestors. Some of these records have been placed online:
See Internet Resources for Finding 19th Century German Emigrants at the FamilySearch Research Wiki.
In addition, Ancestry.com (paid subscription required) has digitized many emigration/immigration-related records (including passport applications). Passport applications in particular often identify the place of origin of the applying person.
The LDS has microfilmed many church records from Germany. If you know the town, use the Place search at familysearch.org. NOTE: LDS microfilms may be ordered at local family history centers in the U.S. and some other countries, but if you live in Germany you cannot use LDS family history centers unless you are a member of the LDS church.
Research in Germany
Recommended Books for German Research
The German Research Companion (rev.ed., Sacramento: Lorelei Press, 2000) by Shirley J. Riemer
German Genealogical Research (n.p.: Geroge K. Schweitzer, 1995) by George K. Schweitzer
A Genealogist's Guide to Discovering Your Germanic Ancestry (Cincinnati: Betterway, 2000) by S. Chris Anderson and Ernest Thode
If I Can, You Can Decipher German Script (San Diego: E. M. Bentz, 1982) by E. M. Bentz
Books recommended by Christine Crawford-Oppenheimer in article In Search of Your German Roots: A Complete Guide to Tracing Your Ancestors in the Germanic Areas of Europe in The American Genealogist, Oct 2001, Vol. 76, No. 3.
Related German Research Sites
(add the best)