Follow the steps below to become a MERN developer:
Learn HTML & CSS - HTML for markup and CSS for design.
Next step to learn Node JS with express framework.
After learning the node you can start learning MongoDB
Congratulation ! you are now a MERN stack developer.
So, what after you have learned MERN stack development. Look you have learned only the basics now. You can start making some small projects. Then gradually start learning advance and make intermediate project also Portfolio website.
Next post I will share some tools that need to know as a developer.