What are some prescribed methods for devotees to serve their Guru and the wider community through literature?

According to the preface in Chapter 0, a Sadguru accepts two primary forms of service from devotees through books. The first is when the Guru creates a great work themselves, and the second is when they have their biographies written by followers. Devotees can engage in this service by studying these biographies and performing Parayans. This act is considered both Guru service and public service, as it allows other devotees to study the works, thereby helping them achieve the purpose of their lives. The Shri Sai Satcharita is cited as a prime example of such a work that facilitates this form of service.