This teachings is from the Nyingma lineage and covers the nyingma practices from the very beginnin to the most advanced. It is over 200 pages long.

"According to the Great Perfection teachings of the Nyingma School of Tibetan Buddhism, all ofBuddhism is classified into two divisions: si'ura (exoteric teachings) and tantra (esoteric teachings). Sutric teachings are further divided into three vehicles: the shravakas, pratyekabuddhas, and mahayanists. 

Tantric teachings are divided into six tantras: the three outer tantras of Kriyayoga, Charyayoga, and Yoga tantra and the three inner tantras of Mahayoga, Anuyoga, and Atiyoga. These three vehicles and six tantras constitute the nine yanas."