How to take a screenshot of part of the screen on iPhone?

How do you take a screenshot of part of the screen on iPhone?

https://t.co/oGGno0TSL7 this will help plus you can just screenshot the screen by pressing the power button and the home button then go onto your camera roll and crop the picture by pressing edit then crop

First, take a screenshot of the whole screen. Then go on photos and zoom into the part you want and then screenshot again. Simple!

Take a regular screenshot (power and home button same time) then in Photos crop it.

Can't you just take a screen shot of the hole screen and crop it.
Home button + power button = screen shot

Press the lock and home button at the same time, then go into Photos and crop the part you want, I do it all the time

Hold the power button and home button at the same time for a few seconds, then in photos you can crop it