The core practice outlined in the PDF is the Soham mantra. However, Soham Swami strips it of mysticism. He teaches that every breath you take naturally makes the sound So (inhale) and Ham (exhale). You do not need to buy a Sanskrit necklace or sit in a lotus position for hours. Simply observe your breath. That is common sense. By focusing on the "I Am" feeling—the sense of existence prior to thoughts—you realize your true nature.
Unlike many saints of his time who advocated bhakti (devotion) as the primary path, Soham Swami championed Jnana Yoga (the path of knowledge). He believed that true spirituality cannot be divorced from common sense and rationality. Common Sense By Soham Swami Pdf
Before we understand his book, we must understand the man who wrote it. Soham Swami was not a typical, mild-mannered ascetic; he was a powerhouse of physical and spiritual strength. The core practice outlined in the PDF is the Soham mantra