This book contains detailed information on Klingon dialects, idioms, history, and variation. It also contains an updated vocabulary list with about 600 words, which makes this book a true necessity for any klingonist.
The chapters in KGT are not numbered like it is the case in TKD. The sorting in the contents' page and also the use of the titles throughout the book make an obvious numbering possible.
Since 1998, there is also a German translation available, entitled "Klingonisch für Fortgeschrittene" (literally Klingon for adcanced). This book does not contain any translation mistakes, like the first edition of translation of TKD did.