Can you please recommend a template and tutorial for managing an ART COLLECTION database for an art gallery?
There is a "Collections" template. Look at how "movies" was implemented.. It has an image.. some fields.. and a link to the "artist" table for the director and actors.. I really do not know the Art business.. but I suspect you may also want a "Patron" table or something to track if an Art piece is on loan from a "Patron" .. and a Donation table to track potential $$$$ donations.
As for as "tutorial" .. There are a few YouTubes floating around about using Ninox.. could start there.
Hope this helps.