How to Setup & Use Photos

Even at this late hour I still come across Mac people that have not setup their Photos App in macOS. They are still using an older version of the OS and just trying to make iPhoto work for them. I think for most Mac users the Photos App is inevitable. If you need to move to the Photos App or know someone else who needs to move, then read this very thorough article describing how to make the move and much of the interworking of the Photos App.