Replit has introduced Replit Agent, an AI Software Engineer that assists in creating full-stack applications. This tutorial guides users through the process of using Replit Agent to build a news app that scrapes data from Hacker News, stores it in a Postgres database, and displays it using Next.js front end. The key steps include signing up for Replit, enabling Replit Agent, starting a new project with a natural language prompt, approving the plan, watching the project build, customizing the scraper, setting up the Postgres database, creating the Next.js front end, deploying the app, and reviewing the results. The benefits of using Replit Agent include speed, simplicity, versatility, and end-to-end development capabilities.