I'm surprised that this hasn't been mentioned.
One thing that Macs have that Windows or Linux does not have is Labels. They work just like the colored labels that you would get at an office supply to use on your files and folders.
You can label files and folders so as to keep track of what has been submitted, what needs to be archived, what pics from a set you have used, etc.
Here is a screen grab of one of my job folders with the Label prefs open.
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