Philosophers and critical students of nature wandered in the jungles of darkness in search of truth, what they could not unfold in centuries, was decoded by Holy Prophet by simply looking statements. It is these decoding keys of treasure of truth which are called Hadith. Author tried for the student of Hadith familiar with the fundamentals of Ilm-e-Hadith which is important for him to know before studying the Ilm-e-Hadith proper.