Here is the story based on Hindu mythology as in why we celebrate Ganesh Chaturthi.

In the divine abode of Kailasa, home to Lord Shiva and Goddess Parvati, a significant event was about to unfold. Parvati Devi, the consort of Lord Shiva, was deep in thought as she prepared for her “Abhyangana” bath, a ritualistic and purifying bath. However, a concern troubled her—who would guard the door while she bathed? All the Brahmins and attendants had gone on an important mission with Lord Shiva, leaving her alone.

A brilliant idea struck her and she decides to create a guardian for herself. So, from the turmeric paste which she used for her bath, she sculpted a beautiful doll. As she admired her creation, an intense thought crossed her mind—what if she gave life to this doll? Driven by her divine powers, Parvati breathed life into the doll, and thus, a young boy was born. Overjoyed, Parvati named him “Bala” and assigned him the duty of guarding the entrance while she bathed.

Parvati instructed Bala, "No one should be allowed inside without my permission." The boy, loyal and dutiful, stood guard at the door, determined to follow his mother's orders.

Meanwhile, Lord Shiva returned to Kailasa. As he approached the door, he was surprised to find it guarded by a young boy. When he tried to enter, Bala stopped him, saying, "Mother has instructed me not to allow anyone inside."

Shiva, astonished by the boy's boldness, asked, "Do I need permission to enter my own home? Who are you, dear child?"

Bala responded, "I am the son of Parvati Devi, and it is my duty to ensure that no one disturbs her."

Shiva, growing impatient, said, "I am Parvati's husband, Lord Shiva. Step aside and let me in."

But Bala, steadfast in his duty, refused, "No one can enter without my mother's permission, not even you."

Shiva's patience wore thin, and in a moment of divine anger, he raised his trident and beheaded the boy.

Soon after, Parvati emerged from her bath and was horrified to find her beloved son lying lifeless on the ground. She cried in agony and asked, "Who did this to my son? Who has killed the child I created and loved?"

Lord Shiva, realizing the gravity of his actions, tried to console Parvati. "Calm down, Parvati. I will bring our son back to life," he assured her.

However, Parvati was inconsolable. "How can you bring him back? His head is gone," she wailed.

Determined to make amends, Shiva instructed his followers, "Go and find the head of the first living being you come across, and bring it here." His attendants set off and soon returned with the head of a mighty elephant.

Using his divine powers, Shiva attached the elephant's head to the boy's body and brought him back to life. Parvati's tears of sorrow turned into tears of joy as she embraced her son, who now had the head of an elephant.

Shiva blessed the boy, saying, "You will be known as Ganesha, the leader of all the Ganas. You will be revered as the remover of obstacles, and all who worship you will be blessed with success and prosperity."

From that day onwards, Lord Ganesha, the beloved son of Parvati and Shiva, became one of the most venerated deities in Hinduism, symbolizing wisdom, prosperity, and good fortune.

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