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New to the Qur'an? Start with The Qur'an: What It Is, How It Came Down, and How It Was Kept, then read Muhammad ﷺ: A Life. All articles: Deen: Start Here.
Deen · Interactive · عِلْمُ الْحَدِيث
How the Prophet's ﷺ words and actions were carried, checked and graded, from one narrator's memory to the great collections, and the arguments still had about it, laid out as pictures and short cards. The long articles go deeper; this is the map.
Sources
Hadith: sunnah.com. Figures for the collections are the ones traditionally given and vary with how repeats are counted. Al-Kāfī's breakdown is the classical count by Zayn al-Dīn al-ʿĀmilī (al-Shahīd al-Thānī); later scholars proposed other splits.