Siri has a built-in cheat sheet. There are other ways to reveal it but the easiest is to have Siri do it herself. Just say “Hey Siri— show me what you can do.”
Items in the list have options. For example, if we click on “Phone” (where it shows “Call Brian”) we get several variations:
And of course the list scrolls, so do some scrolling and some experimenting and find something that works for you.
Check out my Seven Super Siri Tips for more.