What is described as the most effective form of written Guru service for attaining salvation, and what are the specific practices associated with it?

According to the author's understanding presented in Chapter 0, the best and most certain written service for achieving salvation is to write the biography of one's own Sadguru, either by their command or through inner inspiration. This service is not merely about writing; it involves a dedicated practice of personally studying the text regularly, performing hundreds of readings (Parayans) and weekly recitations (Saptahs) with a firm resolve, pure heart, excellent faith, selfless love, and unwavering devotion. It's a comprehensive service of body and speech that does not interfere with family life.