What information is provided about Baba's teachings on 'shraddha' and 'saburi' in Marathi?

The provided source material does not contain any information about a figure named Baba, nor does it discuss the concepts of 'shraddha' and 'saburi'. Instead, the preface in Chapter 0 focuses on the nature and purpose of spiritual texts and Guru biographies. It explains that these texts can be used with desire for worldly gains (Kamya) or with a selfless mind for liberation (Nishkam). The text also highlights that writing a Guru's biography is an ancient form of Guru service, as mentioned in the Narada Purana.