Cortana Commands For Preview Members

for those you are in the new update this was helpful for me
cortana's voice commands work alot better then the normal xbox

Power – Turn your Xbox on and off

“Hey Cortana, Xbox on” (only with Kinect)
“Hey Cortana, turn off”
“Hey Cortana, restart”
Media controls – Control your media playback

“Hey Cortana, pause the movie”
“Hey Cortana, rewind”
“Hey Cortana, play the next song”
Audio controls – Control your sound level

“Hey Cortana, volume up”
“Hey Cortana, mute”
“Hey Cortana, volume down”
Navigation – Getting around on Xbox One

“Hey Cortana, go home”
“Hey Cortana, go back”
“Hey Cortana, show menu”
“Hey Cortana, change view”
“Hey Cortana, switch”
“Hey Cortana, show notifications”
Profile – Sign in and out

“Hey Cortana, sign in”
“Hey Cortana, sign in as John”
“Hey Cortana, sign out”
Friends – Play and chat with friends

“Hey Cortana, is Michael online?”
“Hey Cortana, what’s Amy doing?”
“Hey Cortana, start a party with Ryan”
“Hey Cortana, send a message to Jasmine”
Games & apps – Jump in and have fun

“Hey Cortana, snap friends”
“Hey Cortana, launch settings”
“Hey Cortana, play Forza”
Game captures – Record your awesomeness

“Hey Cortana, take a screenshot”
“Hey Cortana, start broadcast”
“Hey Cortana, record that”

there are a sh1t load more full list here
http://www.xboxoneuk.com/xbox-one/news/cortana-commands-for-preview-members/