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'JavaScript is a programming language that adds interactivity to your website (for example: games, responses when buttons are pressed or data entered in forms, dynamic styling, animation).' Read this intro article on JavaScript
This JavaScript course is divided in three modules. Starting from the simple uses and understanding the basics to the more complex features of the language.
A basic program with multiple functions (reacting to user input)
A tool capable of loading a JSON file and representing it in the DOM
A web app with external data source using at least one API
A good understanding of all the above mentioned topics. Want to check your Knowledge? Go through the JavaScript Fundamentals readme and research/ask for help (Slack!) with the concepts that are not entirely clear.
Helpful resource: http://jsbooks.revolunet.com/ (here you can find tons of free JavaScript books online)