Moses was an important Jewish figure because, he was considered the greatest of all Jewish prophets (a prophet is a Jew who is believed to have received messages from God).
Yom Kippur is, "A day of prayer and fasting and is the most solemn day of the year, on this day Jews follow the examples of God's angels according to traditional beliefs, do not eat or drink."
A Bar mitzvah is a coming of age ceremony in which a Jewish boy turns 13 and becomes, "A fully recognized member of the Jewish community" and, "A time when he promises to try to follow all the Torah's laws."