In the fourth installment of the series on building an eCommerce website using Strapi, Jekyll, Tailwind CSS, and Snipcart, the focus is on creating a product catalog and individual product views. This guide builds on previous parts where a GET request was established between the Jekyll frontend and the Strapi server using the Strapi-Jekyll plugin. Within this segment, users are instructed to add a collection for products in the Strapi endpoint and implement Liquid templating in conjunction with Tailwind CSS to display the product list. It involves creating an HTML file for the product catalog that loops through products and uses a set layout for each product page to dynamically render product details. The tutorial concludes by setting up individual product pages, each linked via a permalink, and hints at the next segment, which will cover cart functionality integration with Snipcart. Links to the final source code for both the frontend and backend are provided for further exploration.