Tishrei, the 7th month in Judaism is a month full of Holy Days: Rosh HaShana; Yom Kippur; Succot; the 8th Day; and Simhat Torah.
The Holidays commemorate the events surrounding the second set of clay tablets that Moses brought down from Mount Sinai after smashing the first set because of Israel's sin with the Golden Calf.
So Tishrei is all about second chances and starting over again and that is why we call the feast of Trumpets the Start of the Year (Rosh HaShana).
The start of the year also refers to the start of the Hashemitic mission on the planet Earth when Adam Kadmon and his Bride the Heavenly Jerusalem Above were first revealed to the repformed Qeinite, Enoch who would eventually become Adam Kadmon's firstborn, Seth. This revelation to the Qeinites marked the start of HaShem's sojourn on planet Earth with his people as Immanuel.
Rosh HaShana is called the Feast of Trumpets because it is like a second Pentecost when HaShem finally responded to the pleading of Moses and appeared a second time on Mount Sinai but would only show him his back. His name was proclaimed as he passed by the cleft in the Mountain with a Trumpet Blast. In the Oral Torah the mountain to which his face was turned crumbled.
Yom Kippur is the day that Moses returned to camp with the new Tablets. The fasted is a sign of our ratification of the covenant.
Succot is the memorial of how the people contributed all of their belongings to the common good for the beautification of the religion. We live in tents to show our willingness to accept poverty if all of our wealth is used for the religion.
The 8th Day marks the end of Succot and the entry into the Messianic era. Simhat Torah is an extension of the same concept of living with HaShem forever.