Read about Soham meditation in the book, ‘Soham Yoga: Yoga of the self’ by Swami Nirmalananda giri
Also found their podcast, Light of the Spirit podcast, https://castbox.fm/va/111818, as well as the website – https://ocoy.org
Found some websites too – https://www.stylecraze.com/articles/amazing-benefits-of-soham-meditation-to-lead-a-healthy-life/