The tutorial on Kong Gateway offers a comprehensive guide on setting up and using Kong to manage and modernize microservices, particularly for applications transitioning from monolithic architectures. It provides instructions on downloading and installing Kong Gateway, adding services and routes, and implementing key authentication and proxy cache plugins through the Kong Manager interface. The tutorial emphasizes the benefits of using Kong Gateway as an abstraction layer to simplify and streamline service management, allowing developers to focus on building business logic while Kong handles common functionalities like authentication and caching. Practical examples illustrate how to configure services, routes, and plugins, with testing facilitated by the open-source tool Insomnia. The tutorial also highlights the architectural freedom and scalability Kong Gateway provides, enabling efficient microservice deployment and management without impacting client interactions.