http://www.tips2secure.com
This video is on all about how to take screenshot on android in a simple way just by holding Power/Lock and Menu button ate the same time for 2-3 seconds and you will have done.
Now taking screenshot on any device is very easy.
Also read step by step guide in a post with screenshot using following url:
http://www.tips2secure.com/2015/10/take-screenshot-on-android.html
