If you have troubles sending screenshots to other people look no further! There's a tool named LightShot that I've been using for years. It's free, fast and works perfectly. Plus, it has advanced options that I'm going to discuss later.
So, how does it work? All you need to do is press your print screen button on your keyboard, select the desired area and depending on what you want to do with the image, either save it, upload it to get a link, or just copy it to paste it to another upload site. if you've never taken screenshots before this is the screenshot button:
The most useful shortcut for quick image sending is CTRL + D, which will instantly upload your image and give you the link which you can send to anybody.
Here's a brief explanation of the interface:
1 - Upload it online and get url [CTRL + D]
2 - Share to social networks (FB, Pinterest, VK, Twitter)
3 - Search for similar images on Google [CTRL + G]
4 - Print the image [CTRL + P]
5 - Copy the image to your clipboard [CTRL + C]
6 - Save the image in the specified directory [CTRL + S]
The right tab is used to edit the taken screenshot (draw lines, shapes, write text etc).