Lava and Kush were born in Maharshi Valmiki’s ashram. Before their birth Sita had requested Valmiki to accept her kids as his disciple. Valmiki basically started education Lava and Kush when they were around 5 years of age. He trained them in archery and they were able to launch arrows at the speed of sound. He also trained them about divine & celestial warfare. He made them masters in archery so that nobody on this planet could conquer them in war. He established a connection between his mind and Lava and Kush’s mind and directly transmitted all his knowledge to them.
After military skills, he taught them the art of singing and playing the veena. He taught them the Ramayana, which was written by Maharshi Valmiki himself, keeping Rama as the centre point. Later, Luv and Kush used their singing skills to infuse love for Sita in the Ayodhya’s people.
Uttara Kanda has the mentions of Lava Kusa of how they met their father and returned back to Ayodhya. It is the last Book of the great epic Ramayana and it deals with the return of Rama to Ayodhya and his coronation to the throne. This Kanda also gives a description of the birth of Lav and Kush, the two sons of Rama in the hermitage of Valmiki and the episode ends with the description of the last days of Rama in the world.