The Xbox One's improved Kinect has proven rather successful so far. The voice commands are a great feature, and better yet, the Kinect doesn't even require perfect enunciation to understand what you're saying. Still, the feature is only useful if you know the commands, and some are less obvious than others.
You've likely already figured out the basics, like "Xbox, turn off" or "Xbox, go home." But did you know that in order to directly call someone on Skype, you have to add that contact to your Skype favorites? What exactly is "Xbox, show my stuff"?
Anyway, here is a handy guide to the Kinect voice commands. Take a look -- you may learn something.
Thanks to DNA2251 for the tip!