MongoDB Mastering MongoDB for Beginners (Theory and Projects) - Solution (Update Operators) - `8

The video tutorial explains how to handle data in a terminal by copying data from a file and using the DB update function. It focuses on adding a 'school' tag to documents if not already present, using the 'add to set' operator. The tutorial demonstrates the execution of this operation and shows the results, concluding with a brief wrap-up.

Describe the process of how the update operation checks for existing tags before adding a new one.

What was the initial content of the tags before the update operation was performed?