It is the oldest known monotheistic religion still practiced in the world today. Its primary teachings have been powerful and are the foundation for more newly developed religions such as Christianity and Islam.
Jewish history, beliefs and traditions recorded in the Hebrew bible beginning as early as the 8th century BC.
Their book is called "Torah", which is their bible that has the five old testament: Genesis, Exodus, Leviticus, Numbers and Deuteronomy.
Jewish beliefs center on the conviction that there is only one God.
Their sacred text, the Hebrew Bible teaches several doctrines like those about God, the Messiah, human beings, and the universe which making beliefs very important to Jews.
Unlike many religions, Judaism does not focus much on abstract cosmological concept. Although Jews have certainly considered the nature of God, man, the universe, life and the afterlife at great length there is no mandated official, definitive belief on these subjects.
There is significant room for personal opinion on all these matters, because Judaism is more concern about actions than beliefs.