Apple has a page that lists all current Apple operating systems. At the moment, it shows:
- iOS 17.3.1 for iPhone
- iPadOS 17.3.1 for iPad
- macOS 14.3.1 for Macintosh
- tvOS 17.3 for Apple TV
- watchOS 10.3.1 for Apple Watch
- visionOS 1.0.2 for Apple Vision Pro
I strongly recommend that you bookmark this page:
https://support.apple.com/en-us/HT201222
as Apple updates it when new versions are released.
You should also note that, further down the page, it documents when Apple security updates were released, and what machines they covered.
If you want to be informed, via email, of security updates, go to this page,
https://lists.apple.com/mailman/listinfo/security-announce
fill in the blanks, and Apple will send you an email every time a security update is released.
This page,
https://lists.apple.com/mailman/listinfo
shows several other mailing lists, covering everything from accessibility features, how to write programs in AppleScript, how to configure Macs and Apple devices for use in the federal government, and other even more obscure topics.
But what if I want to know more?
If you want to get very geeky, you can apply for a free Developer account,
which gives you access to Apple programming tools, where you can build applications, write scripts, and do odd things, some even useful.
If you are curious about programming, but aren’t sure if it is for you, know that most Apple software is written in a programming language called Swift. It has nothing to do with a famous singer. You can play with Swift using Swift Playgrounds, available for iPad and for Mac. You can read about that here:
https://developer.apple.com/swift-playgrounds
Swift Playgrounds can be downloaded, for free, from the Mac app store and the iOS app store.