My preferred method of installing node is through Homebrew. This allows you to install with the correct permissions.
$ brew cask install npm
$ npm install -g bower
Compile Sass to CSS and minify
$ grunt css
Concatenate scripts and minify
$ grunt js
Reload browser upon file changes
$ grunt watch
Copy theme to a versioned release directory and compresses to a zip
$ grunt build
Checks if your NPM or Bower dependencies are out of date.
$ grunt versioncheck
Sass files are located in the assets/css/sass directory.
All variables are located in assets/css/sass/_settings.scss.
grunt js concatenates all js files on ln 24 of Gruntfile.js.
Initialize all js within assets/js/src/init.js.