This is not the book to get you instantly started with grunt and its zillion plugins. But its a very good introduction to the topic! Before starting with any standard plugins, you write some mini tasks by hand and learn the real workings of tasks and targets. After that you have the ability to start a grunt installation anywhere you like and use plugins with more confidence. The drawback is indeed the size of the book. But then again you can finish it in 2-3 days and learn something. Not bad I would say.