You may have seen this years ago, but many have not. The Calculator app has two calculators: the standard calculator that you have used all the time, plus a scientific calculator which you get by turning the phone sideways, like you would do with a landscape photo.
What I just learned yesterday is that you have two stopwatches. It’s very difficult to watch progress on the digital stopwatch, but when you swipe to the left you get a beautiful analog stopwatch (with a digital inset).
Can you teach me more of those tricks with built-in apps? Not looking for apps to install but useful features that are not obvious.