MERN stack refers to a set of technologies used in developing web applications, including MongoDB, Express.js, React.js, and Node.js. Next.js is a popular framework for building server-rendered React applications. A MERN Stack Developer with Next.Js course in Lahore might cover the following topics:

1. Introduction to MERN stack and Next.js
2. Setting up the development environment (Node.js, MongoDB, and React.js)
3. Basic concepts in JavaScript, including variables, functions, and control flow
4. Building RESTful APIs with Express.js
5. Storing and retrieving data with MongoDB and Mongoose
6. User interface design with React.js and Next.js
7. Building dynamic web pages with server-side rendering and Next.js
8. Handling user authentication and authorization with Passport.js and JWT
9. Building scalable and maintainable web applications with MERN stack
10. Deploying web applications to cloud platforms like Heroku or AWS
11. Testing and debugging web applications
12. Best practices for structuring and organizing MERN stack code
13. Advanced concepts in JavaScript, including asynchronous programming and closures
14. Building real-time applications with WebSockets and Socket.io
15. Using third-party libraries and frameworks like Redux and GraphQL
16. Optimizing web application performance and scalability
17. Building full-stack e-commerce applications with MERN stack
18. Collaborating with other developers and contributing to open-source projects
19. Understanding security considerations in web development
20. Integrating web applications with third-party APIs and services.