The three Jewels is another term for: The Buddha, the Dharma (his Teachings) and the Sangha (the Monks). Thank you for reacting to this Bryan! Yes i fully agree, that tibetan Buddhism is different. It uses extensive, elaborate Methods in Rituals, Offerings, Meditation Methods, Teachings etc. When japanese Zen Buddhism is very minimalistic, dry and simple in Appearance, tibetan Buddhism is the complete Opposite, a vast elaborate baroque Universe of thousand armed Buddhas. The unique thing is tibetan Buddhism is heavily influenced by the Pre Buddhistic shamanistic indigenous Bon Religion, so it is very esoteric. Bryan, if you do react to Lama Tsem Rinpochr next time,please watch his Video "Dorje Shugden Oracle taking Trance in Kechara".
This Guru Yoga, is a Part of Ngöndro, the 4 Preliminary Practices. It is practiced by all who pursue the Buddhist Tantra Path. I have uploaded a Video about Ngöndro on my Channel. There each step is explained.