What are the key aspects of observing Lent in Christianity, including its beginning, the reasons for fasting, and essential practices?

Here are the answers to your questions for the Christianity section:

1. Either (Christianity):

a) The day that marks the beginning of Lent in Christianity is Ash Wednesday.

b) Two reasons why Christians fast during Lent:
i. To imitate Jesus' 40-day fast in the wilderness, preparing for his public ministry.
ii. As a form of spiritual discipline and penance, to repent for sins and draw closer to God.

c) A Christian fasting during Lent should observe prayer, repentance, self-denial, and acts of charity (almsgiving), focusing on spiritual reflection and growth.