About Root tantra

root tantra tantras/treatises which explain everything concisely. The root-tantras and their commentaries are practical manuals for all tantric literature and are based upon what is known as the root-tantras. Guhyasamaja-Tantra is the first of the root tantras describing yoga techniques as well as the mandalas, mantras, and rites associated with the propitiation of a particular deity and his retinue.