Although Boiko's writing style can be a bit overbearing, all-in-all this is the book of choice to comprehensively learn the ins and outs of content management from a top-level perspective. It is very complete and adds a ground-layer and blueprint to anyone trying to get into content management on any level, in any organization.
On first glance, you will be overwhelmed though. Hang in there, it will accompany in all your CM projects!