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I'll take you through my thought process and practicalities of building a browser based VJ engine - based off my RBVJ engine, which recently won the W3C web audio challenge.
Chrome Browser Youâ€™ll need to have the latest version of Chrome installed https://www.google.com/chrome/browser/desktop/index.html
Live Server: This is going to make your life so much easier and coding so much faster and fun. For Atom, simply go Preferences->Packages and search and install Live Server https://atom.io/packages/atom-live-server For maximum happiness make sure your default browser is Chrome.
A basic understanding of the web and HTML: Again, not really needed, but will go a long way in helping you get more out of the course and make better art.