According to the initial chapter, for what specific purpose are auspicious invocations performed, and which deities are mentioned in this context?

According to Chapter 1 of Shri Sai Satcharitra, the primary purpose of performing auspicious invocations, or Mangalacharan, at the start of any endeavor is for its 'obstacle-free completion' and the 'fulfillment of the desired goal.' The author adopts this tradition to seek blessings for writing the book. To this end, Chapter 1 details salutations to several key deities: Lord Ganesha, the elephant-faced remover of obstacles; Goddess Saraswati, the goddess of speech and knowledge; the divine trinity representing creation, preservation, and destruction (Brahma, Vishnu, and Shankar); the family deity Narayana; and ultimately Sadguru Sainath himself.