You can use grunt serve for minified files.
You can use grunt serve:dev for the normal files, it won't watch.
compass - sass to css compiling to the public/css directory.
concat - moving the js files to the public/js directory.
cssmin - minifying the css files.
uglify - minifying the js files.
clean - to clean the outdated and unused files.
injector - injecting the public css/js files in the html.
watch - check for changed files and update the public files.