What is a source for teaching Judaism?

Answer 1

The Torah, the Talmud, the Code of Jewish Law and the commentaries are some examples.
Other early works include the midrashim, and the Zohar (a mystical commentary on the Torah). The purpose of the midrashim is to expand upon the brief narrative-portions of the Torah.
The works of later Rabbis include books on Jewish outlook and belief, such as the Emunot VeDeot (8th century CE) and the Kuzari (11th century); books listing the Jewish laws, such as the Yad Hachazakah (12th century) and the Shulchan Arukh (16th century); books on piety, such as the Noam Elimelekh and the Mesillat Yesharim (18th century); books on ethics, such as the Maalot Hamidot and the Hafetz Chaim (19th century), and much more.

Answer 2

The writings of Judaism may be divided into several categories. These include: the Tanakh, the Talmud, the other works of our early sages, and the works of later Rabbis.

• The Tanakh (Hebrew Bible) is also called "the Written Torah," in contrast to the Oral Torah, which is the body of tradition that was handed down orally for some 1500 years, and only after that put in writing, so as not to be forgotten in times of exile. The Oral Torah is contained in the Talmud, whose chief purpose is to clarify the laws of the Torah, and which is a multi-volume compendium of Jewish traditions, law, history, and sayings of the early Jewish Sages.
  

See the Related Link.

Link: More about the Talmud

• Other works of the early sages include the midrashim, and the Zohar (a mystical commentary on the Torah). The purpose of the midrashim is to expand upon the brief narrative-portions of the Torah.

The works of later Rabbis include books on Jewish outlook and belief, such as the Emunot VeDeot (8th century CE) and the Kuzari (11th century); books listing the Jewish laws, such as the Yad Hachazakah (12th century) and the Shulchan Arukh (16th century); books on piety, such as the Noam Elimelekh and the Mesillat Yesharim (18th century); books on ethics, such as the Maalot Hamidot and the Hafetz Chaim (19th century), and much more.

Link: Some Jewish ethics

• Contents of the Written Torah: The Jewish holy book is the Tanakh (Hebrew Bible), containing the Torah and the prophetic books. "Tanakh" is a Hebrew acronym of T, N, K which stands for the three parts of the Tanakh: Torah, Nevi'im (Prophets), and Ketuvim (Writings). In total, the Tanakh has 24 books.
  

Link: The history of the Hebrew Bible