Ian R. Brown wrote: … "Not in an album" sounds a tad simpler . . . would you advise me to go with that one?
Pretty much the same. I have lots of Smart Albums! The one I showed is named Temp 3 because I leave those set up so I don't need to make a new Smart Album every time I need a special search.
Keywords are really important to use with the Filters and Smart Albums. You can set a keyword for Family that you use with family pictures, and the Filter can get you just those. And you can do more with a Smart Album-- you can ask for all pictures that aren't family.
I also use keywords and Smart Albums to rate pictures.
Choosing Favorites using Keywords in Mac Photos
Ratings are very useful. If I'm looking at pictures from last month, I may look at "Favorites." If it's from last year, maybe just the ones rated 4 or 5. If from last decade, maybe only 5s. That sort of thing.
suggestion about folders etc.
That line should have been
"You can put a picture into several different albums, without using any extra storage space"