Añadir las urls de una app:

urlpatterns += [
    path('catalog/', include('catalog.urls')),
]

Redirigir una url a otra:

urlpatterns += [
    path('', RedirectView.as_view(url='/catalog/')),
]

Urls con parámetros:

...
path('users/activate/<token>/', views.activate, name='users_activate'),
...
def activate(request, token):
   user = get_user_model().objects.get(token=token)
...
url = reverse('users_activate', args=(user.token,))

Enviar parámetros a la view:

path('my_courses', CoursesListView.as_view(), {'mine': True}, name='my_courses'),
# In this example, for a request to /blog/2005/, Django will call views.year_archive(request, year=2005, foo='bar').

from django.urls import path, register_converter
from . import converters, views

class FourDigitYearConverter:
    regex = '[0-9]{4}'

    def to_python(self, value):
        return int(value)

    def to_url(self, value):
        return '%04d' % value

register_converter(converters.FourDigitYearConverter, 'yyyy')

urlpatterns = [
    path('articles/2003/', views.special_case_2003),
    path('articles/<yyyy:year>/', views.year_archive),
    ...
]