Apple really, really wants you to tag your files

While Apple hasn’t overtly said so, tagging appears to be becoming increasingly important across its platforms, and will likely help you get things done.Apple extends tags support
Apple will extend support for tags to Notes and Reminders on iPhones, Mac and iPads soon. These work in the same way as tags already do when tagging documents, images, and other assets on your Mac, making it much easier to find relevant collections of such content, and enabling powerful smart folder searche