I spent the day teaching seniors how to use an iPhone

Article note: iOS really is fucking ghastly if you aren't used to it. I don't own an iOS device but regularly try to help other people with them, and Apple seem to have done their absolute best to make nothing discoverable. Did I just make a gesture by how I was holding the device? What did it do? Can that feature only be accessed by a gesture? Can I long press this control for more options? What's tied to the effectively-mandatory vendor account? Why is it auto-completing wrong passwords from the integrated password manager and how do I change them? What the hell information did it autofill on this site/service when I "Signed in with apple?" How do I do "back" in this app, the method I used in the other app doesn't seem to apply? ...