Kostas Bariotis explores the evolution of static site generators and shares his transition from using Ghost to Gatsby.js, a modern static site generator. He highlights the simplicity and efficiency of static site generators like Jekyll, which streamline the process of creating and deploying static HTML content without the need for complex server-side infrastructure. Bariotis delves into the advantages of using React and the Virtual DOM for faster rendering, especially when combined with server-side rendering. He praises Gatsby.js for its client-side routing, extensive API, and ability to seamlessly generate content from various backends, including WordPress, while maintaining a separation between content and presentation layers. By adopting Gatsby.js, Bariotis benefits from features like hot reloading and modularized code, ultimately enhancing his site's performance and development workflow.