For the editions of the newsletter that comes out right after a update for macOS or iOS, there are a set of links to Apple Support pages that I include regularly. Apple updates these support pages with new information after an update.
Some of these “What’s New” pages are fairly well hidden in user guides or the developer documentation. The search on Apple’s support page is often not very effective in finding them, so I have built myself a list of links over time.
I have also included links to some support pages that I frequently use or refer others to, as well as some third party links with great reference pages.
Since I plan on updating this list when necessary, I have made a separate page: