http://qgu356nwwy7dweo276qk6rkts4pgpgm3vjjmedsifunu5yope52vdbid.onion/index.php/Django_for_Beginners_3
If you look at the "INSTALLED_APPS" section of "settings.py" you can see which app names are off-limits: admin, auth, contenttypes, sessions, messages, and staticfiles. A general rule of thumb is to use the plural of an app name–posts, payments, users, etc.–unless doing so is obviously wrong as in the common case of "blog" where the singular makes more sense.