How did ravana get 10 heads?

In Hindu mythology, Ravana, the king of Lanka and a central character in the Ramayana, is often depicted with ten heads as a symbol of his immense knowledge, power, and mastery over the Vedas. According to some legends, he performed intense penance to please Lord Brahma, who granted him a boon of great strength and wisdom. The ten heads represent his ability to understand all aspects of life and his mastery over the ten senses. Additionally, they signify his multifaceted personality, embodying both devotion and arrogance.