That project is part of Welcome to the Django course (https://welcometothedjango.com.br). It's aimed to solidify the knowledge along the course.
First you should create a virtual environment to separate dependencies (make sure you have Python 3.7 or above installed):
$ python -m venv .wttd
And activate the fresh created environment:
$ source .wttd/bin/activate
Install Django:
$ pip install django
And start the server:
$ python manage.py runserver