This tutorial introduces Rails 7 and its integration with New Relic One for monitoring and observability. It guides users through creating a new Rails application, setting up New Relic One monitoring and observability, deploying the app to Render, and introducing an error feature to demonstrate the potential of New Relic One in diagnosing issues. The tutorial covers key steps such as installing the Ruby gem, downloading the configuration file, deploying to Render, and adding an error button to manually create errors for testing purposes. By following this tutorial, users can gain hands-on experience with integrating New Relic One into their Rails applications and improve their application's performance and reliability.