GG! In video games, Good Game is a common shorthand for signing off after winning or losing a match. For this website? It's about Going Global! Global Competence and Global Education!
Global Competence: The ability to navigate and embrace diverse cultures, challenges, and opportunities with an informed, open-minded, and proactive approach.
Global Education: An immersive learning experience that transcends borders, cultivating critical thinking, empathy, and cross-cultural understanding through global perspectives and real-world connections.
Asia Society's video is a helpful breakdown, but there are also a lot of various articles and books on this including Harvard Project Zero's Guide.
The California Global Education project guide has a downloadable rubric you can use and self-assess your own progress with as well!