Short answers, pulled from the story.
Prahlada was the son of Hiranyakashipu who became a devoted follower of Vishnu while still in his mother Kayadhu's womb. He listened to Narada's chants during pregnancy and continued learning devotion from Narada during his early childhood.
Hiranyakashipu attempted to destroy Prahlada through poison, weapons, eight elephants known as the aśtadiggajas, venomous snakes, and a fire with Holika. Each attempt failed because Vishnu resided within Prahlada or protected him directly.
The Hindu festival of Holi celebrates the event where Holika burned to ashes while Prahlada remained untouched on her lap. This story continues to be honored annually across India and beyond.
Sites linked to Prahlada include Prahlad Ghat in Hardoi, Simhachalam temple, Malakonda, Kadiri, Yadagirigutta Temple, and the Narasimha Temple at the Vedic Planetarium in Mayapur. Additional sacred locations exist in Pakistan such as the Prahladpuri Temple in Multan.
After Hiranyakashipu died, Prahlada ascended the asura throne and ruled peacefully by conquering three worlds without lifting a weapon. He later left regency to Andhaka and erected an ashrama to apologize for losing his dharma when Indra asked him for good conduct.