Why Holika Dahan is done
At the behest of Hiranyakashipu, her sister Holika Prahlad sat on her lap and sat in the burning fire, after which Prahlad was protected by the fire by the grace of Lord Vishnu, but Holika was consumed by burning. After which Holika is burnt every year as a symbol of the victory of good over evil.
Where did Holika Dahan happen first

For the first time Holika Dahan was done in Bihar. According to Srimad Bhagwat and Skanda Purana, Sikaligarh Dharhara village located in Banmankhi in Purnia district is considered to be the place of Holika Dahan. According to the belief, in the golden age, Lord Vishnu took the Narasimha avatar and protected the devotee Prahlada from the fire.
Holika Dahan in Bihar

Holika Dahan is celebrated with great pomp in Bihar. On this day, people here make pakoras in their homes and in the evening, the festival of Holika Dahan is celebrated. Not only this, during Holika Dahan, people sing and sing on the drum drums.
How is Holi celebrated in Bihar

Holi of Bihar is also known as Phagwah or Phalgunotsava. In Bihar, people here play Holi with colors in the morning and in the evening, they put Abir-Gulal. In many areas, this Holi also runs the next day which is known as ‘Basiura’.
Holi of Bihar is incomplete without Fagua

In rural areas of Bihar, people are considered incomplete without Fagua. Let me tell you, according to the Indian Hindi calendar, the festival of Holi comes in the month of Phalgun. In such a situation, the songs that are sung on Holi are known as ‘Fagua’ and without these songs, the Holi of people of Bihar is completely incomplete. Apart from Bihar, Fagua is also in Jharkhand and parts of Uttar Pradesh, which is celebrated on the festival of colors with songs of Holi.