Thrangu Rinpoche, who is one of the most outstanding living teachers of the Kagyu tradition of Tibetan Buddhism, elaborate here on a text on basic meditation by Jamgon Kongtrul the Great. The book gives a detailed explanation on tranquility meditation (shamatha) and insight meditation (vipasyana). The book is very detailed and accesible, and is useful for all meditators, no matter what level they are on, as it deals with all levels in meditation and also on how to deal with different experiences that may arise. I can't recommend it enough!