This summary highlights the key points of the text. JAMstack is an architectural pattern that allows web applications to be fully functional and robust without relying on application servers. The four primary benefits of adopting a JAMstack architecture are higher performance, stronger security, cost-effective scaling, and a better developer experience. GatsbyJS is a popular static site generator that can help get started with JAMstack. Hasura is a GraphQL engine that can be used to create a CRUD backend, and YugabyteDB is a PostgreSQL-compatible distributed SQL database that can be used as the backend for Hasura. The author sets up YugabyteDB, creates a Hasura cluster, and configures Gatsby to use Hasura's GraphQL API. They also set up GraphQL subscriptions using Apollo Client to fetch real-time data from the database. The summary highlights the ability of JAMstack with Gatsby, Hasura, and YugabyteDB to provide both SEO-friendly static markup and real-time dynamic updates.