To create a "polls" app in the "apps" sub-directory, do the following first to make the directory (assuming you are at the root of your django project):

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mkdir apps/polls

Next, run startapp to create "polls" in under the "app" project directory.

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startapp polls apps/polls

Install the app;

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INSTALLED_APPS = [
'apps.polls'
]

migrate:

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makemigrations polls
migrate

optional:
main urls.py

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urlpatterns = [
path('polls/',include('apps.polls.urls'),
]

See Also

django migrate