By collecting tribute and through warfare

Aztec religious practices influenced warfare by encouraging the belief that capturing prisoners in battle for sacrifice would please the gods and ensure prosperity for their civilization. This belief system gave the Aztecs a strong motivation to engage in warfare and expand their empire through conquest. Additionally, the Aztec military was often led by high-ranking religious figures, further intertwining religion with their military operations.

In Aztec schools, students primarily studied religion, history, mathematics, agriculture, and military training. They were taught the religious beliefs and practices of the Aztec culture, the history of their empire, as well as practical skills such as farming and warfare.

most important thing about the Aztecs warfare was to take use the people they defeated as sacrifices

The purpose of warfare was to gain captives for future sacrifice.