The best thing about Django is its documentation. It is one of the best (if not _the_ best) documented projects I have ever used. Example: Let's say you are reading about Django authentication related stuff and somebody links for further clarification to https://docs.djangoproject.com/en/1.7/topics/auth/default/.
Bam! You immediately know it's outdated (emphasized by the headline) and switch to https://docs.djangoproject.com/en/1.9/topics/auth/default/. This might seem minor, but I highly appreciate such attention to detail. And I really like the official page's layout, look and feel which concentrates on information, rather than stupid, flashy animations. Ha, looks like I'm getting old.