We don't use cron but systemd timers for jobs that need to run recurringly.
python manage.py processnotifications
Sends notification emails for new blog posts.
Triggers daily at 10AM server time.
python manage.py mailexports
Emails users their blog exports.
Triggers monthly, first day of the month, 6AM server time.
./backup-database.sh
Triggers every 6 hours.