In order to link a created tag with a static directory, go to the CMS, open your project and select the "Directory" module in the menu
Then you select an existing static directory or create a new static directory. You can find out how to create a directory here.
To link tags, select an entry and scroll all the way down.
At the bottom of the page, you will then find the option to link one or more tags to the selected entry. To do this, click in the search bar to select an existing tag or click on the + to create a new tag.
You can find out how to create a tag here.
As soon as you have linked all the desired tags to the entry, click on save in the lower right corner.
If the tags have been linked, they can be used as filters in the frontend: