What are the two main benefits of a devotee writing and sharing a detailed poetic biography of their Guru?

Based on the provided text in Chapter 0, there are two significant benefits. Firstly, by studying and performing Parayans of a detailed Guru biography that they have written, the writer performs a direct service to their Guru. Secondly, when other devotees also study and perform Parayans of that same work, the writer gains the additional merit of serving God within humanity, which is referred to as 'Jan-Janardan,' and performing public service. This allows those other devotees to also progress spiritually and achieve the purpose of their lives, creating a dual benefit for both the author and the community of followers.