The book contains scales formulas, possible chord types that scales might be used over, three universal guitar scale diagrams with degrees for each scale (that might be used in any key), scales/modes relations to other scales, other possible scale names and tips on how and when to use each scale (with the shapes of the most useful chord types over the scale shapes). The book contains diatonic scales and modes, pentatonics, hexatonic scales and exotic scales.
Diatonic modes: Ionian, Lydian, Mixolydian, Aeolian, Dorian, Phrygian, Locrian
Pentatonic modes: Major Pentatonic, Egyptian, Banshiki-Cho, Ritusen, Minor Pentatonic, Kumoi, Japanese, Chinese, Hirajoshi, Iwato, Hon Kumoi Shiouzhi, In Sen, Lydian 13 Pentatonic, Aeolian 9(b13) Pentatonic, Locrian 11 Pentatonic
Exotic scales: Persian, Spanish, Neopolitan Major, Neopolitan Minor, Hungarian Major, Hungarian Minor, Hungarian Gypsy, Balinese, Arabian, Enigmatic, Hindu, Algerian, Zangula, Javanese, Rahawi, Hawaiian, Overtone, Leading Whole Tone, Todi, Mohammedan, Lydian Dominant b6, Marva, Isfahan, Prometheus, Prometheus Neapolitan, Oriental, Spanish 8 Tones, Scriabin, Piongo