Like this, by word of mouth. That’s how Apple has done UI design since they stopped printing paper manuals.
- ctrl-shift-. to show hidden files on macOS
- pull down to see search box (iOS 18)
- swipe from top right corner for flashlight button
- swipe up from lower middle for home screen
Not restricted to Apple, but TIL: Double-clicking on a word an keeping the second click pressed, then dragging, allows you to select per word instead of per character.