Explore the foundations of building the metaverse in this 3-hour workshop from IEEE VR 2022. Delve into two interconnected directions: technological and engineering aspects for developing metaverse ecosystems, and content creation within the metaverse to provide user ownership. Examine supporting technologies such as Mixed Reality, computer vision, IoT, robotics, Blockchain, user interaction, future networking, cloud and edge computing, and Artificial Intelligence. Investigate the building blocks of the metaverse ecosystem, including avatars, presence, virtual economy, content creation, social acceptability, privacy, and ethics. Discuss applications like games, digital commerce, remote work, study, and training. Learn about 'metacreation' and the importance of user-generated content in enriching and developing diverse virtual worlds within the metaverse.