Before moving on to the link for Nebraska, be sure you check out the various general indexes on the home page. These include military records, Presidents, slavery and African-American data, historical events, historical data, Native American data and miscellaneous data.
Once you are at the Nebraska Genealogy and History web page in Genealogy Trails, you can click on any of the 93 counties in the state. Each county has a different webmaster and thus different databases and links. They can be anything from cemeteries, marriages, census, biographies, obituaries to military records.
Now go exploring at Genealogy Trails History Group ... have some genealogy fun!