Beginner
Get Started (devcenter.heroku.com)
Intro to Heroku Screencast (www.codeschool.com)
What is Heroku? (www.youtube.com)
GitHub Integration (devcenter.heroku.com)
Staging vs Production Environments (softwareengineering.stackexchange.com)
Pipelines (devcenter.heroku.com)
How Heroku Works (devcenter.heroku.com)
Command Line (devcenter.heroku.com)
Heroku Postgres (devcenter.heroku.com)
Managing Add-ons (devcenter.heroku.com)
Intermediate
Advanced