So who actually wrote the chapters in the Koran? And what are the Hadiths about and who wrote them?
The Hadiths are oral traditions of the words and actions of Mohammed or of his closest companions. There are differing views within Islam as to exactly how much authority is to be given to which hadith. They are generally divided into three groups, based on how certain they are believed to come from Mohammed: authentic, good, and weak. Many scholars doubt the legitimacy of any of them, and there are small groups within Islam (particularly the Quranists) who contend that only the Quran should be authoritative. Nevertheless the hadiths are widely used and respected. They, instead of the Quran, tend to be the primary basis for the details of Sharia law.