Choose which screen you want to capture, such as an iPad, iPhone, or iPod touch. Any iOS device will capture a screenshot of your display or screen in .png image format, which will be stored in your Photos app library.
Reference Image:
Step: 01
Hold down the On / Off Switch
Step: 02
Press the Home button once.
(You should press the home button only once without holding it too long, as doing so will shut down your iPad.)
Screenshot is taken & stored & saved in your photos app library…!!!
I hope it helps!
Thanks & Regards
Mandar Apte