The book contains 1,322 ḥadīths about the manners of the Islamic prophet Muḥammad. Despite its significance, this book is overshadowed by Imam al-Bukhari's more famous collection of ḥadīths, al-Jami' al-Sahih, otherwise known as Sahih al-Bukhari.
Imam al-Bukhari did not impose the same strict conditions of authenticity on the ḥadīths in al-Adab al-Mufrad as he did for those in al-Jami' al-Sahih. However, later scholars who examined, commented on, and classified the chains of narration in al-Adab al-Mufrad found that most of its narrations are authentic or, at the very least, sound.
Amrayn.com uses Imam al-Albani’s work for classification of these aḥādīth.