What has helped historians learn about the Inca empire?

Historians have learned about the Inca Empire through a variety of sources, including archaeological findings such as Machu Picchu and other Inca sites, Spanish chronicles written during the colonial period, oral traditions passed down by descendants of the Inca civilization, and the deciphering of the Inca's unique system of record-keeping, known as quipu. These sources have provided valuable insights into the Inca culture, society, economy, and history.