Concerns in Rails: Everything You Need to Know

P.S. I originally published this post last year, when I was just starting to learn Rails. Since then, I've learned a few more things and hence decided to edit, revise, polish, and re-publish it. Also, a ton of new subscribers have joined the email list, and I thought you all might find it helpful.Many Rails applications, including the framework itself, make heavy use of concerns. However, if you are new to Rails, concerns can be confusing to understand. When I started learning Rails last year, concerns were one of the topics that took a really long time for me to understand.