Whenever you want to share a part of your Android phone’s screen through screenshot, the only way is to take screenshot of the entire screen and then crop it the way you want. Looks like this is going to change. The latest version of Android has a hidden feature.
This is an upcoming Android feature. The feature is currently comes with Android 7.0 Nougat, but is not available directly to anyone.
A reddit user unearthed this while digging the Android source code. You will need a physical keyboard connected to your Android device to test this.
Partial Screenshots on Android
The combination is CTRL+META+S for fullscreen and CTRL+META+SHIFT+S for crop.
META on Windows is the Windows key, and the COMMAND key on Mac. Here is a video demo of this feature:
We will update this page as and when this feature becomes available for all users on Android.