tldr: Learn Elmish by working up to the Counter sample app from scratch. Prerequisites This post assumes that you are already aware what Fable is. Knowledge of Elm might help, but is not required. It’s also assumed that you have the following installed: F#: Parts of the Fable compiler are written in F#. The “Use” tab on the fsharp.org site can walk you through F# installation. Node.js: Fable takes advantage of the JavaScript Node.