Embrace the 'clarity over cleverness' philosophy of DHH and 37signals in your Ruby on Rails projects. This skill provides domain expertise extracted from production codebases like Basecamp and HEY, guiding you to write clean, maintainable, and pragmatic Rails applications. It helps you build features using 'vanilla Rails' conventions, such as fat models, thin controllers, RESTful resource mapping, and database-backed solutions for queues and state management, while avoiding common but often unnecessary abstractions and dependencies.