On the Sabbath and various festivals, certain foods are eaten, such as wine (Purim and other occasions), challah bread (Sabbath), fish, especially gefilte fish, dairy (Hanukkah and Shavuoth), matzoh (Passover), apples and honey (Rosh Hashanah), fruits (Tu Bishvat), and more.
If your question refers to details of keeping kosher, please see the attached Related Link.
the only special building and the only one is the synagogue
Israel
Jerusalem
Rabbis and cantors
Of course not.
The is no such thing as a "judaism".
Judaism does not have a centralized leadership.
Belief in God and in the Torah.
Jews worship in synagogues.
No, Jews worship in synagogues.
The lord God or Yahweh is the diety in Judaism.
Judaism's primary language is Hebrew