Kalin Chernev's blog post discusses the migration of a personal blog from Hugo to Gatsby, highlighting the benefits and challenges of using Gatsby for static site generation. Chernev opted for a custom-built approach rather than using pre-existing themes, focusing on making the site more generic and reusable. The post details the ease of content migration, programmatic page creation using React components, and styling with Typography.js, while emphasizing the advantages of Gatsby's JavaScript toolchain and plugin system. Chernev also explains the implementation of pagination and tag pages, and the development of an admin panel using NetlifyCMS to enhance content management. The migration was driven by the desire for a more developer-friendly environment and a production site that behaves like a single-page application, leveraging Gatsby's modern web technologies for improved performance and ease of use.