Rosh HaShanah is the Jewish New Year, a time of prayer, self-reflection, and repentance.
Moses went and spoke these things to all Israel. He said to them: "I am now one hundred and twenty years old, I can no longer be active. Moreover, the Eternal has said to me, 'You shall not go across yonder Jordan.'" - Deuteronomy 31:1-2
Yom Kippur means "Day of Atonement" and refers to the annual Jewish observance of fasting, prayer, and repentance.
Give ear, O heavens, let me speak; Let the earth hear the words I utter! - Deuteronomy 32:1
Sukkot is one of the most joyful festivals on the Jewish calendar. “Sukkot,” a Hebrew word meaning "booths" or "huts," refers to the Jewish festival of giving thanks for the fall harvest. The holiday has also come to commemorate the 40 years of Jewish wandering in the desert after the giving of the Torah atop Mt. Sinai.