Here is your short paragraph on Rosh-ha-Shana:
This is the New Year’s Day of the Jews that occur in the month of September or October, on the first day of the seventh month (Tishra) of the Hebrew calendar and is in commemoration of the agricultural life of ancestral Jewry when the year began with the first month of autumn.
A day of celebration when Jews put on new clothes and pious Jews prepare for it by a daily fast from morning to evening for thirty days preceding.
The celebration begins with the kindling of festive lights in the home and the synagogues over which a special benediction is recited.
Rosh-ha-Shana marks the advent of the high holidays and introduces the annual Ten Day of Penitence (days of awe).