Separating view logic from bloated models can help maintain the model in the long run.

Adding translations into your website does not have to be hard. With Rails built in I18N functionality, we gain access to many helpers and conventions that makes it a much easier task. Learn how to add I18N into your Rails application.

Give early warning to users of form errors before they submit. With client side validations, the user can correct any errors prior to submitting the form.

Using Interact.js to create draggable and droppable items in our view, we can use AJAX callbacks on events to interact with our Ruby on Rails application. Also, learn how to use Ruby Assets to manage our Javascript Libraries.

Mountable Engines are a great way to extract code into its own namespace and allow the code to be reused in other applications. Other popular gems that are mountable engines are Devise and Doorkeeper.