What is the meaning of a Gharib Hadith, what are the classifications of Hadith, and which of them are accepted and which are not?

In the Arabic language, "Gharib" refers to something singular or unique. In the terminology of Hadith (definition) scholars, it is a Hadith that has been narrated by only one narrator. The Gharib Hadith falls under all the rulings of Hadith; thus, some of it is Sahih (definition) (authentic), such as the Hadith: "Deeds are only by intentions." Some of it is Hasan (definition) (good), and some of it is Da'if (weak), which is the predominant category. For this reason, it was said: "Do not write down Ghara'ib (singular narrations), for they are Manakir (denounced), and most of them are from weak narrators." The categories of Hadith, in terms of acceptance and rejection, are: Sahih (authentic) and Da'if (weak). The Sahih Hadith must be acted upon and can be used as proof, while the Da'if Hadith is neither acted upon nor used as proof. The Sahih Hadith is divided into Mutawatir (mass-narrated), Mashhur (well-known), and Ahad (single-chain), and into Sahih and Hasan. As for the Da'if Hadith, it has many categories, among which is the Mawdu' (fabricated), which is not permissible to narrate except to warn against it.