I just completed the Washington, D.C. Metropolitan POlice Department Online Firearms Safety Training Course. It’s actually well done and informative. There are a few parts particular to D.C. laws but other than that, nothing odious. The animations are generally well done and informative for newcomers to firearms ownership. The course took me about half an hour to complete.
There were only two errors noticeable to me, one technical and one typographical. I’ll let the webmaster know about them.