These are the video tutorials that I recommend for learning more about the 1940 U.S. federal population census, and what you can find out about your ancestors in this census.
U.S. National Archives & Records Administration
Routinely check Ancestry for naturalization records pertaining to your immigrant ancestors and relatives. A visit to NARA Riverside in April confirmed that Ancestry still does not have all of the district court naturalization records from California online, but a discovery last week indicates they are closing this gap.
The U.S. National Archives & Records Administration (NARA) announced yesterday a 5-year partnership with The Generations Network (TGN), parent company of Ancestry.com, to digitize selected NARA records. TGN will provide the staff, hardware, and software, and will make the digitized records available online to Ancestry subscribers. Access to those records will be available for free, …