Lesson 1 of 8, a Tuts+ course on Build a Modular App in Rails 5 taught by Markus Mühlberger. The full course is available at: https://code.tutsplus.com/courses/build-a-modular-app-in-rails-5?utm_campaign=yt_tutsplus_WjU5XD4Hnyw&utm_medium=referral&utm_source=youtube.com&utm_content=description Become a Tuts+ member to get access to hundreds of new courses and eBooks!