The document discusses different types and grades of yoga according to Bhagavad Gita and other scriptures. It describes four main types of yoga - Karma Yoga, Jnana Yoga, Astanga Yoga, and Bhakti Yoga. Bhakti Yoga, which involves selfless devotion and service to God, is considered the highest and most practical form of yoga. Within Bhakti Yoga there are different processes and methods to attain pure love and devotion to God either through a gradual path of other yogas or more directly through practices like chanting and remembering God.