To leave on good foundations.

The first part is devoted to the single player campaign (about 1/3 of the book), then the rest devoted to multiplayer.
The solo part is very comprehensive and if you get stuck on something, you will find the solution.

When the multiplayer game, it is very provided also very good advice for now good habits on the management of the economy, the use of shortcuts, etc ... With the part that contains in my opinion the most interesting and most useful content for the long term: retail units. The tech tree of each race is detailed and commented, with a page devoted to each unit and part of the buildings. Very useful to learn everything there is to know about his next opponent.
Still, it must read everything to be unbeatable!

The only flaw in my opinion they do not provide basic building model or timings, for the regular days has put the game could distort the information given. We must therefore manage.
But a little research on the web you can find everything you need: lots of casters provide commentary on youtube videos. I myself have discovered Tolki offering us "Thursday newbies" very interesting and very complete the book because it really offers us an exit strategy from on which to play, and adjust later!

In summary a very nice book, very useful (I still would use I think mainly for the details of the maps and units), but not necessarily essential for all these information can be found on the canvas.