Phil breaks down complicated game theory plays into parts that laymen can understand. His book is broken down into two parts. The first part goes over strategy and looks at each option from a lot of different perspectives including sometimes how a poker program is designed to play as close to perfect poker at all times. The second portion goes over topics that can help you hold on to the money you are making from poker. Phil even goes over some personal reflections that let you learn from his experience.
Playing poker from a mathematical perspective, especially limit hold em, can be all the edge you need at the table to consistently win. Phil puts that perspective in plain English and makes it accessible to all of us.