Early on, when Navajo people lived in the northern part of North America (modern Canada), they lived in small houses they called "hogans". You built a hogan by propping a few poles together and covering the surface with branches, leaves, and mud.
But when the Navajo moved south and settled in the south-west part of North America about 1400 AD, they gradually settled down and began living in permanent houses so they could farm. They called these houses "hogans" too.
You build a permanent hogan by laying wooden poles or logs on the ground, and then laying more poles on top of those poles, going around and around. When the walls are high enough you narrow them in to make a domed ceiling. Then you plaster over the wood with mud to fill in all the spaces between the poles. This is something like medieval half-timbering, or like a round log cabin. Navajo people always built hogans with the door on the east side, so the morning sun would come into their house. Hogans had dirt floors and only one room. If people needed more room, they built more hogans near their first one, so that a Navajo home often had a bunch of hogans, one for each wife if there were several wives in the family, and maybe a sweathouse also (to get clean in, like our bathrooms), and separate buildings for storing things in (like our basements or attics).
Most hogans were houses where kids lived with their mother and father. People called these houses "women's hogans". Men also built smaller hogans, called "men's hogans", which men used for religious ceremonies and for a sweat bath. These hogans were built completely differently - more like the earlier traveling hogans. You take three forked wooden sticks and stand them up so that their forks tangle together and they lean on each other like a tipi. Then you lean two more poles up against these to make the doorway. Then you lean up more poles all the way around to fill in the walls, and cover the whole thing with earth. So a "woman's hogan" usually had horizontal logs in the walls, and a "men's hogan" usually had vertical logs in the walls.
Inside the hogan, women sat on the right, or the north side, where they kept their cooking things, and men sat on the left, or the south side. People slept on mats on the floor, with their feet toward the fire in the middle of the hogan.