A concise, step-by-step guide to deploying a Python Flask app on Heroku: set up Flask locally, create a Heroku account, install dependencies with pip (Flask, Gunicorn), add requirements.txt and a Procfile, adjust the app to listen on 0.0.0.0:5000, initialize Git, commit and push to Heroku, then scale and manage via the Heroku dashboard—includes starter code and essential commands.