Path:

relative_path

Brings the data to the format you need for the include

Should be used in the applications

add_relative_path

Activates URLs from applications

Use it in {project_name}/urls.py only

include

Includes your application URLs

add_absolute_path

Activates URLs directly

When using add to

# {project_name}/config.py
... Some code
# Special urlpatterns
urlpatterns = [
    '{project_name}.urls',
]
... Some code

This path is undesirable to use