1. SECRET_KEY - A secret key used for cryptographic signing.

  2. DEBUG - A boolean indicating whether debug mode is enabled.

  3. ALLOWED_HOSTS - A list of valid hostnames that the application can run on.

  4. INSTALLED_APPS - A list of installed applications for the project.

  5. DATABASES - A dictionary defining the project's database settings.

  6. MIDDLEWARE - A list of middleware classes used in the application.

  7. STATIC_URL - The URL to use when referring to static files.

  8. TEMPLATES - A list of template engines to be used for the project.

  9. TIME_ZONE - The time zone for the project.

  10. LANGUAGE_CODE - The language code for the project.

  11. USE_I18N - A boolean indicating whether internationalization support is enabled.

  12. USE_L10N - A boolean indicating whether localization support is enabled.

  13. USE_TZ - A boolean indicating whether time zones are used in the application.