The most common key combination which 6.0 Marshmallow also applies to Android, but the following:
Pressing and hold simultaneously the following keys:
Power On / Off
Volume Down
After about two seconds of the screenshot is triggered 6.0 marshmallow in Android and saved this. About the status bar you can watch this view quickly and delete again when needed.
Generally screenshots in Android 6.0 are iled marshmallow on the internal memory in the folder "screenshots".