The number one means of travel and transport in the middle ages was walking.
Horses were used both as mounts and beast of burden. Horses were quite expensive, especially horses that were fit for military service. Long distance trade used primarily pack horses rather than carts or wagons for transport because of the unreliability of the condition of roads. Carts, both hand carts and horse drawn carts, were used on the local level for transportation of cargo, however. But in many cases porters were hired to simply carry goods.
Castles in the Middle Ages were used to keep out enemies.
See the question: What are some weapons used in the middle ages?
In the Middle Ages
because they used wood smoke as a deorderant in the middle ages
people in the middle ages used letters or talking to face to face
to entertain
YES
knights
Yes, polyphony was used during the Middle Ages. We do not have any real idea of when polyphony was introduced, but the earliest texts describing it date to the Early Middle Ages. By the end of the Middle Ages, it was highly developed. There is a link below to an article on polyphony, beginning at the section on its origins.
the middle ages
It was used in the middle ages by monks!
The period of time from 500 AD to 1500 AD is called the Middle Ages.