The tutorial provides a comprehensive guide on creating real-time dashboards using open-source tools without relying on third-party services. It emphasizes the challenges of designing an architecture that effectively updates data from the database to the frontend, highlighting the use of Cube as a middleware to facilitate real-time data updates through WebSockets while polling the database. The tutorial demonstrates the process using both MongoDB with its BI Connector and Google BigQuery, detailing the setup of Cube applications, data schema creation, and integration with React and Chart.js for frontend development. It also covers deployment on Heroku, offering a step-by-step approach for deploying both the Cube API and the dashboard application as a static website. The guide, originally authored over three years ago, notes that some frontend boilerplate generation steps may be outdated, advising users to refer to up-to-date resources.