According to Chapter 48 of the Sai Satcharitra, what are some common practices that do not necessarily define a true Sadguru?

Chapter 48 of the Shri Sai Satcharitra clarifies that several common spiritual practices do not automatically qualify someone as a Sadguru. The text explicitly states that the wise do not consider those who simply study the Vedas, have knowledge of the six Shastras, or explain Vedanta to be Sadgurus. Furthermore, the chapter mentions that practices like controlling one's breath (Pranayama), wearing heated marks (Taptamudra), or merely pleasing an audience with talks about Brahman are insufficient. This distinction is made to emphasize that a Sadguru's qualities go far beyond superficial knowledge or ritualistic practices, as mentioned in the chapter's opening sections.