What is the primary focus of the first chapter of the Shri Sai Satcharitra, and why does it begin this way?

Chapter 1 of the Shri Sai Satcharitra is primarily dedicated to 'Mangalacharan', or auspicious invocations. As detailed in this chapter, it is a traditional and wise practice to offer salutations to various deities at the start of any significant task. This is done to ensure the obstacle-free completion of the work and to obtain the grace of the desired deities. The author offers salutations to Lord Ganesha, Goddess Saraswati, the Guru, the family deity, and ultimately, Sadguru Sainath. The purpose of this auspicious beginning, as Chapter 1 explains, is the removal of all hindrances and the successful fulfillment of the desired goal, which in this case is the writing of Sai's life story.