If you need a tagging kind of system to track folders, you can change color of the folder. I love it.
A small extension in Nautilus can do this job. To install this extension, open terminal / terminator and execute following commands.
sudo add-apt-repository ppa:costales/folder-color sudo apt-get update sudo apt-get install folder-color
Once installed, restart machine or Nautilus.
Once done, right click on any folder. You’ll see Folder Color option where you can change folder color to any of your choice and reset it too.