there is error in building first app part 2 code in installed apps;

Using Django
1

ModuleNotFoundError: No module named ‘polls.apps.PollsConfigdjango’; ‘polls.apps’ is not a package .
this error is showing

2

It looks that you missed a comma after 'polls.apps.PollsConfig', it should be:

INSTALLED_APPS = [
    'polls.apps.PollsConfig',
    'django',
    ....