You will need an open Terminal.
Note: If you don't have Homebrew go to https://brew.sh in order to install it. It's simple. Maybe something as:
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
brew install python3
mkdir my_new_project
Let's go into the new directory:
cd my_new_project
python3 -m venv myNewEnv
From here we need to activate the new environment:
source myNewEnv/bin/activate
pip install django
Pillow is for images:
pip install pillow
pip install psycopg2
django-admin.py startproject my_new_project .
./manage.py startapp my_new_app