Welcome to the MDN beginner's JavaScript course! In this article we will look at JavaScript from a high level, answering question such as "What is it?" and "What you can do with it?", and making sure you are comfortable with JavaScript's purpose.
Now you've learned something about the theory of Javascript and what you can do with it, we are going to give you an idea of what the process of creating a simple JavaScript program like, by guiding you through a practical tutorial. Here you'll build up a simple "Guess the number" game, step by step.