SHRI YANTRAM SADHANA-SIDDHI is a richly detailed spiritual guide that explores the theory and practice of Shri Yantra — a powerful sacred geometric diagram used in meditation and ritual for inner transformation and fulfillment.Written by Dr. Vagish Shastri in Sanskrit and Hindi, the book spans approximately 265 pages and blends traditional wisdom with practical insights for seekers, scholars, and practitioners.It offers readers both the philosophical foundations and step-by-step approaches to sadhana (spiritual practice) aimed at attaining siddhi (spiritual realization and success).The content delves into the symbolism, ritual techniques, and metaphysical significance of Shri Yantra, an ancient tool in Indian esoteric traditions believed to harmonize consciousness and material existence.Published by Deep Publications, the book stands as a valuable resource for anyone interested in classical Indian spirituality, yantra worship, and the deeper aspects of mantra-based practice.