ShareX
ShareX is a very lightweight and feature-rich desktop recording software. The intuitive user interface ensures that it is very easy to operate as well. This software will allow you to capture the screen in various shapes using shortcuts. The software will then use an image editor in order to edit the images or screen recordings that were taken. It helps you crop or blur the captured images. It has another fantastic feature that automatically uploads images to hosts like Flickr, Imgur, Imageshack, or Tinypic.
Why you must get it: 
It has various features like capturing screenshots that include fullscreen, rectangle, monitor, window, and other shapes. You can even add some effects, watermarking, annotations, and more within ShareX itself. Additionally, you can upload any images, or even take a printout. The best thing in this software is that it is highly configurable, allowing you to map your own shortcut keys its different tools.