Based on the YouTube playlist of Christopher Okhravi and in the head first book i`ve created a repository to consolidate my learning and help other to find resources and learn on the fantastic way of the design patterns
https://www.youtube.com/watch?v=v9ejT8FO-7I&list=PLrhzvIcii6GNjpARdnO4ueTUAVR9eMBpc&index=1