Where it started?

Judaism started in South west Asia. The Hebrews created this religion. Abraham was the original founder.

What were some of the basic beliefs?

There were many basic beliefs in Judaism. One was that that one day God told Abraham to leave his home and take his family on a long journey to the West. Another belief was that God told Abraham that his descendants would create a mighty nation. Another strong belief is Abraham left Mesopotamia and settled in Canaan.

Where did Judaism spread?

Judaism spread through Persia. Spread threw Babylon. Judaism spread throughout Israel.