Photo book
I know I can't print a book on Photos, but can I make a book on Photos having my new Mac OS Catalina 10.15.3?
Mac mini 2018 or later
Question marked as
Apple does no longer offer any print services, but on macOS 10.15 Catalina you can install third party project extensions from the AppStore to create books in Photos.
SeeOT's user tip: Post 9/30/2018 Printing Options for Photos
And also: Create and order print products in Photos with Project Extensions - Apple Support