How to Deploy a Flask or Django App with Gunicorn and Nginx

[Unit]
Description=Gunicorn for myapp
After=network.target

[Service]
User=alex
Group=www-data
WorkingDirectory=/home/alex/myapp
RuntimeDirectory=myapp
ExecStart=/home/alex/myapp/venv/bin/gunicorn --workers 3 --bind unix:/run/myapp/gunicorn.sock --umask 007 app:app
Restart=on-failure

[Install]
WantedBy=multi-user.target

sudo systemctl daemon-reload
sudo systemctl enable --now myapp
systemctl status myapp

server {
    listen 80;
    listen [::]:80;
    server_name example.com www.example.com;

    location /static/ {
        alias /var/www/myapp/static/;
    }

    location / {
        include proxy_params;
        proxy_pass http://unix:/run/myapp/gunicorn.sock;
    }
}

sudo ln -s /etc/nginx/sites-available/myapp /etc/nginx/sites-enabled/
sudo nginx -t
sudo systemctl reload nginx

DEBUG = False
ALLOWED_HOSTS = ["example.com", "www.example.com"]
STATIC_ROOT = "/var/www/myapp/static/"
CSRF_TRUSTED_ORIGINS = ["https://example.com", "https://www.example.com"]

sudo mkdir -p /var/www/myapp/static
sudo chown alex:alex /var/www/myapp/static
./venv/bin/python manage.py collectstatic

curl -H "Host: example.com" http://127.0.0.1/

cd /home/alex/myapp
git pull
./venv/bin/pip install -r requirements.txt
sudo systemctl restart myapp