"Hey, Cortana," and ask your question. How to turn on Hey Cortana on Windows 10
Press the Windows key + S simultaneously to open Cortana. Click the Notebook button. It's the little notebook icon underneath the house icon on the left side of your screen. Click on Settings .
Click on the On/Off switch underneath the Hey Cortana heading. Now anytime you want to search the web, know the weather forecast, or get the baseball scores from last night, all you have to do is say "Hey, Cortana," and ask your question.