Many people when researching forget to use reference materials in concert.  While this sounds strange, sometimes it doesn’t even cross their minds.  Example: Found the ancestor in the census but that year doesn’t have everything you want (or you prefer more than one documented source) – look in other state, county, and local records as well as local newspapers.  Could they have belonged to a local church or (fraternal) organization?  Don’t leave these out of the search!