Is there any official tutorial for iOS app development?

I found one: "Start Developing iOS Apps (Swift)"

But it says:

"IMPORTANT

This document is no longer being updated. For the latest information about Apple SDKs, visit the documentation website."

I could not find a similar content (latest, i.e. still under support) in the apple.com

I am just wondering whether there is an official tutorial for iOS app development, like one for Android: https://developer.android.com/guide/ The Android tutorial above is a comprehensive and very good start so that almost you do not need to refer to outside unofficial tutorials. I am looking for the similar one for iOS app tutorial.