Most people you contact frequently have a defined relationship with you. This covers not only the standards -- eg. husband, wife, son, Mom -- but extend into business territory. These can include relationships like editor, boss, and partner.
Relationships can be manually defined in the Contacts app but it's better to let Siri do it for you.
Invoke Siri and state the appropriate command such as "Bob Witherspoon is my boss. Answer Yes to Siri's confirmation query and from that point forward the relationship can be substituted for the proper name.
These include commands like "call my brother at home" and "text my boss saying the report will be ready tonight".
The Hey Siri" feature invokes Siri when you utter the phrase. It eliminates the need to use the Home button. It doesn't sound like much but over time reduces the effort to use Siri.
Note that the device must be plugged in for Hey Siri to work, and it must be turned on in Settings | General.
To make sure Siri interprets your spoken commands correctly, in Siri's settings turn on the function to always give you voice feedback. Siri will give vocal feedback to all commands before executing them. You can also set Siri to do this when using a hands-free device to keep things more private,
Siri often works better when you slightly alter your query. My favorite example of this is to ask "when is the next Houston Rockets game?" instead of something to do with the schedule. As you can see in the image Siri gives a nice display detailing the next game, including if and where it can be seen on TV,
Have a contact with a name Siri can't master? That's easy, just correct it when it happens by telling Siri to learn to pronounce it. This will cause Siri to get it right in the future and end the madness.
When it's time to settle up your portion of the lunch bill rather than reaching for the calculator app, ask Siri how much the tip should be. Ask "how much is a 20 percent tip of a $13.67 bill?" This gets you the tip and total with it applied.
Time change for a scheduled meeting? Don't fiddle with the calendar app, just tell Siri to "move my 2:30 to 4".
Need to have a set meeting? Let Siri do all the work by saying "schedule a meeting with my boss for tomorrow at 2pm". This marks it in your schedule and sends an invite email to the named contact. Responses are handled normally by the system.
When you're on the road you often need to figure out how much something priced in another currency is in your local currency. To get an instant answer, just ask Siri "how much is 92 pounds in dollars?"
Most iOS settings can be accessed directly by Siri. Ask it for Bluetooth settings for example and Siri takes you there.