Paul Scanlon's blog post outlines the process of using Gatsby to fetch data from the Unsplash API and convert it into individual web pages, leveraging Gatsby’s Deferred Static Generation (DSG) to optimize build times. The post details the steps to source data from the Unsplash API, store API keys securely using environment variables, and utilize the unsplash-js package to make authenticated requests. It explains how to add data to Gatsby’s data layer using createNode and discusses the creation of pages through the createPages API, utilizing GraphQL queries to manage data nodes. The post also highlights the benefits of DSG, which allows developers to defer page generation based on specific criteria, like the number of photo likes, to improve user experience by generating popular pages ahead of time while deferring less-visited ones until accessed. Additionally, it describes the creation of a page template using React components to render data and includes a demonstration project with styling implemented through TailwindCSS.