What are the beliefs of the seventy-three sects, and did they all deviate?

Question:
Did the seventy-three sects all deviate completely? Is there a book that explains the beliefs of these people and their scholars?

Answer:
You are not obligated to know their beliefs. The important thing is to know that, as the Prophet (peace and blessings be upon him) informed us, they opposed the methodology of the Messenger (peace and blessings be upon him). This Ummah will split into seventy-three sects, all in the Fire except one. They asked: Who is that, O Messenger of Allah?
He said: The one who is upon what I and my Companions are upon. And regarding their being in the Fire, they are not all on the same level. One is in the Fire for his disbelief, and one is in the Fire for his misguidance, even if he did not reach the level of disbelief, and he is punished according to the measure of his sin. One of these is from the category of the warning for them; they are not all the same. Yes.