The Land of Israel
The Torah tells us that the Land of Israel (Eretz Yisrael) was part of the covenant made between God and the Jewish People at Mount Sinai. However, there is no one view of Israel among modern day Jews. Some strongly support Israel, while others feel conflicted by the politics of the region. The only thing that can be said across the board is that Israel is part of every Jew's worldview, in one way or another.
Messiah
Judaism teaches that one day a Messiah (a person from God) will unite the world and bring peace to humanity. The concept of the Messiah is not a central part of every Jew's belief system, but tradition does teach that the Messiah will be descended from the family of King David.
Judaism On One Foot - Summing Up Judaism
There is a story in the Talmud that is often told when someone is asked to summarize the essence of Judaism. During the first century B.C.E. a great rabbi named Hillel was asked to sum up Judaism while standing on one foot. He replied: "Certainly! What is hateful to you, do not do to your neighbor. That is the Torah. The rest is commentary, now go and study." (Talmud Shabbat 31A.) Hence, at its core Judaism is concerned with the well-being of humanity. The particulars of every Jew's individual belief system is the commentary.