"Advice", written as a set of instructions for a private collector and was based on Naudé's own experience and research. In the introduction of his book, Naudé wrote that he is not an expert in the field of librarianship but he presented what he believed to be the most important ideas. He based some of the opinions in "Advice" on his own experience in Mesme's library, and wrote out for Mesme the accepted practices and principles of librarians of the time. Chapters covered topics such as number of books, selecting the books, procuring the books, etc.