Knowing the modern science of the ruler

Al -Hafiz said in the introduction to the book about the reason for his authorship: For when I saw innovation in our time, there was a lot, and people know the Sunnah that I have said, with their reluctance to write news, and the large number of its applicants for neglect and neglect, this invited me to classify a light book that includes the types of hadith science, which he needs, News students,...