Heroku

Cloud Application Platform for Web and Mobile Apps

Beginning Heroku

Complete the Quickstart Guide
Watch the Intro to Heroku Screencast

You should be able to

Write a Procfile.
Store secrets and environmental variables in config vars.
Deploy a basic app to Heroku.
Provision an add-on.
Add a dyno to an app.

Intermediate Heroku

You should be able to

Understand the worker pattern.
Achieve dev-prod parity by using foreman locally.
Leverage Heroku logs as a source of visibility into app performance.
Build an app with a concurrent web server.
Understand request queuing.
Use a tool like New Relic to gain visibility into response time variability.