Fasting is not required during Advent.
They can and do eat whatever they wish to eat during Advent.
No, there are no Catholic fast days during Advent. Ash Wednesday and Good Friday are the only fast days during the Liturgical Year.
Christians fast as a sign of penance and sacrifice, but are not required to do so
The Gloria is not said at Mass during Advent and Lent.
The Roman Catholic church has a tradition of lighting Advent Candles during the four weeks of Advent.
Yes, Catholics traditionally observe a period of fasting and abstinence during the Advent season. This typically involves abstaining from meat on Fridays and fasting by limiting food intake on certain days, such as Ash Wednesday and Good Friday. The specific requirements may vary depending on local customs and the guidelines set by the individual's diocese or bishop.
because hyms hymns are prayers, and you pray a lot during advent.
Advent is a time of preparation for the coming of Christ at Christmas.
The primary thing that you have to do during Advent is to prepare for Christmas, you do this through confession, Mass, and prayer.
People first started celebrating advent at the birth of Jesus.
In the Traditional Roman Rite the Alleluia is used on Sundays of Advent along with the Gradual, but if the Mass from the Sunday is used during the week the Alleluia is omitted. It is not omitted during Advent in the Divine Office.
I am not sure what you mean by Advent Saint. There are hundreds of saints who have a feast day during Advent, including St. Nicholas of Myra. However, if any saint would be named as the Advent Saint it would be St. John the Baptist as the Gospels during Advent speak of him preparing the way for the Lord.