What are some practical ways for devotees to serve our Sadguru and build a community around his teachings?

According to the preface of the Shri Sai Satcharita, a Sadguru accepts service from devotees through books in two primary ways. One method is by having biographies written by devotees, which are then used for study and devotional readings, known as Parayans. As detailed in chapter 0, when devotees study and perform Parayans of a detailed Guru biography, it is considered a form of Guru service. This practice benefits not only the writer but also the entire congregation of devotees, who can achieve the purpose of their lives. This shared study fosters a sense of community and is seen as a form of public service and serving God in humanity.