Janeu Sanskar is a Hindu ritual performed when a boy reaches a certain age and is ready to begin his education. It is also known as the Upanayana ceremony, which marks the beginning of the sacred thread ceremony.

The Janeu Sanskar Puja is a complex and lengthy ritual that involves many steps and is typically performed by a priest. Here are some of the key aspects of the ceremony:

1. Preparation: The boy undergoing the ceremony must first take a purifying bath and wear new clothes. He must also fast until the ceremony is complete.
2. Introduction: The ceremony begins with an introduction to the boy's family, friends, and guests. The priest will explain the significance of the ceremony and its importance in Hindu culture.
3. Yagna: A fire is lit, and offerings are made to the gods. The boy will also offer oblations to the fire as a symbol of his commitment to his studies and his faith.
4. Janeu: The boy is then given a sacred thread called the janeu, which is worn over the left shoulder and hangs down the right side of the body. The thread symbolizes the boy's commitment to his studies and his responsibility to follow the principles of Hinduism.
5. Mantras: The priest recites mantras and chants to invoke blessings from the gods and to guide the boy on his spiritual path.
6. Feasting: The ceremony concludes with a feast for all the guests, which is considered an important part of the celebration.

The Janeu Sanskar Puja is an important ritual in Hinduism and is believed to mark the boy's entry into the world of education and spiritual growth. It is a time for the family and friends to come together and celebrate this milestone in the boy's life.