They didn't use the wheel for transport, they didn't have a writing system for records, and they didn't have iron for making tools.They built a large system of roads that went throughout the empire. The roads were usually made with stone. Stone steps were often built into deep areas in the mountains. They also built bridges where the roads needed to cross rivers. The main reasons for the roads was for communication, moving army troops, and to transport goods. Commoners were not allowed to travel on the roads. The basic unit of distance used by the Inca was one pace or a "thatkie”
they communicated by runners on the road . Fast young men called "chaskis" would run from one relay station to the next. At each station they would pass the message on to the next runner. Messages were either passed verbally or by using a quipu . Messages traveled quickly this way at the rate of around 250 miles per day. The messengers who ran on the roads were punished harshly if the message was not accurately delivered. This rarely happened.
Inca believe in various Gods. They believed Viracocha created the world first, then made people of clay and stone . Inca adapt to the skills of the states they have conquered and improve them