It is imperative that before learning the MERN stack, one has a basic understanding of web development. You must therefore have knowledge of HTML5, CSS3, and JavaScript before you can begin learning MERN Stack. Gaining these skill sets will help you learn MERN Stack more quickly as you work your way through its complexities. But if you are a beginner, it won’t be a big issue to get all these things. Your basics will be all cleared with in the course itself.