A global tags database allows us to centralize our tags and apply them consistently throughout our dashboard. Instead of having a free-form "tags" field within each database we will create a centralized list of tags that can be applied to any database.
Having this centralized list of tags will also allow us to drill into the tag itself to find everything throughout our dashboard where we applied the tags. It allows us to see all notes, tasks, projects, goals, media, and contacts where we assigned the tag in one page.