What is the primary focus of the first chapter of the Sai Satcharitra, and which deities are invoked?

The primary focus of the first chapter of the Sai Satcharitra is the Mangalacharan, or auspicious invocations. As detailed in Chapter 1, the author begins by offering salutations to several deities to ensure the obstacle-free completion of the book. These invocations are directed towards Lord Ganesha, Goddess Saraswati, the trinity of Brahma, Vishnu, and Shankar, the family deity Narayana, and ultimately, Sadguru Sainath himself. The chapter explains this is a traditional practice for attaining auspiciousness and fulfilling the desired goal of narrating Sai's life.