JavaScript fundamentals: Get a strong foundation in the basics of JavaScript, including syntax, data types, variables, loops, functions, and objects.

React: Learn the basics of React, including components, state, and props, and build simple single-page applications (SPAs).

Node.js: Learn how to build backend applications using Node.js and the Express framework.

MongoDB: Learn how to work with MongoDB, including how to store and retrieve data, and how to perform basic database operations.

Connecting the MERN stack: Learn how to connect the frontend and backend of a web application using React and Node.js, and how to use MongoDB as the database.

Advanced React: Learn advanced concepts in React, such as handling forms, working with APIs, and building complex user interfaces.

Deployment: Learn how to deploy a MERN stack application to a live production environment.

Note: The learning journey for the MERN stack can be long and complex, but the above road map can be used as a starting point to guide you in the right direction. It is important to take your time and not rush the learning process, as a strong foundation in each of these technologies is critical for building scalable and maintainable applications.