Use tags to organize files
You can tag files and folders to make them easier to find. Tags work with all your files and folders, whether you store them on your Mac or keep them in iCloud.
Tag files and folders
You can add multiple tags to any file.
Tag an open file: Hold the pointer to the right of the document title, click the arrow, click in the Tags field, then enter a new tag, or choose one from the list.
Tag a new file when you save it: Click File > Save. In the Save dialog