Create and deploy an application:
$ heroku apps:create [optional_application_name] $ git push heroku master $ heroku run rake db:migrate
Populate database with sample data (optional):
$ heroku run rake db:seed
And that's really it. Especially if you use Rails 5. With previous version of Rails there were other changes needed, like installing rails_12factor gem, getting rid of WEBrick and other small tweaks. But that isn't the case with Rails 5.
Also, I forgot to mention it in the video, but you should set your ruby version. You can do it in Gemfile:
source "https://rubygems.org" ruby "2.3.1" # ...