What is Guru service, and does the text describe different kinds?

Guru service is presented as a path to enlightenment, following the guidance of Lord Samarth Sadguru Dnyaneshwar Maharaj to "serve the saints with your entire being." The source material from Chapter 0 outlines several types of this service. One form is worldly service, such as writing biographies of great historical figures, but this is considered limited in its spiritual fruit as it is often rooted in self-interest. A higher form is writing the biographies of saints, which yields spiritual benefits but is still considered partial. The text ultimately elevates the service of writing and studying the life of one's own Sadguru as the most complete and spiritually rewarding form of Guru service.