$ npm i -g elm

That will install the following tools:

• elm-repl
• elm-make - for compiling elm files
• elm-reactor - a dev server
• elm-package - for managing packages

For more details, as well as editor/IDE integrations, see the install section of the guide. Also note elm-format, which auto-formats your code according to the official styleguide.

$ elm package install --yes
$ elm reactor
$ open http://localhost:8000

• The official docs
• Egghead.io course
• Awesome Elm
• Elm Town Podcast
• Elm Conf 2016 Videos