Hoop coops are generally considered some of the easiest coops to build. Here's some good links:
Hoop Coops
https://www.backyardchickens.com/articles/hoop-tractor.69336/
https://www.backyardchickens.com/articles/hoop-coop-brooder-with-roll-up-sides.75720/
https://www.backyardchickens.com/articles/the-biddie-bordello-a-hoop-coop-run-combo.72189/
https://www.backyardchickens.com/articles/permanent-hoop-coop-guide.47818/