Siri can do a lot of things and the list continues to grow. Find out what she can do by asking! Day "Hey Siri: what can you do?" and she'll give you a list.
Siri is good at math. Simply put your math question into words and she will solve it. Yes, this is "Word Problems." You probably thought you were through with them.
Siri can adjust screen brightness! Easier than doing it by hand, and after adjusting the brightness, Siri leaves a slider for you to play with just in case.
Siri can turn the flashlight on and off. Very handy, especially when you do it hands-free (via "Hey Siri"). Try it in the dark!
The iPhone makes a great alarm clock. Siri makes it easy to set. Tell Siri when to wake you up and she (he) will do it. Bonus tip for clearing alarms.
Hunting around on your iPhone for an app you know is there can be frustrating. The better way is to ask Siri to launch it.
Siri is good at providing sports information, including scores, game times, and TV channels. Get in the habit of asking Siri for sports information before you turn to the web.