To view the Customers, Properties, Visits, etc where you used tags, click Resources Tab>Tags
Find the tag you want to view and click the number under the column for the category you want to view where you used the tag.
That will take you to a list of items with the tag you chose to view.
In this example I chose to look at the Events where I’ve used the tag “back yard“
To learn how to create and edit tags click here