What is the primary purpose of the invocations at the beginning of Sai Satcharitra's first chapter?

Chapter 1 of the Sai Satcharitra, titled 'Mangalacharan', begins with a series of invocations to various deities. The text explicitly states that this auspicious beginning is a traditional practice performed by the wise at the start of any task. According to Chapter 1, the reason for these salutations to Lord Ganesha, Goddess Saraswati, and others is twofold: for the obstacle-free completion of the work and to obtain the grace of the desired deities. The purpose is the fulfillment of the author's goal, which is to successfully write the sacred life story of Sai Baba. This traditional etiquette is adopted specifically for attaining auspiciousness and ensuring the project's success.