You can take good screenshots with several tools – this list contains the basic tools of the most common operating systems. A few things to remember though: If your bug involves an action, chances are high that a video is necessary to capture the cause and the result, and when you take a screenshot, don’t forget to show the URL field on it too!
Tools on different OS
Chrome / Firefox
Awesome Screenshot Plugin: https://www.awesomescreenshot.com/
Being one of the highest-rated annotation tools for images with a simple user-friendly and intuitive interface, Awesome Screenshot Plugin offers all the necessary editing tools and more to adjust your screenshot to our quality requirements for attachments and specifically screenshots.
Sign up, drop your screenshot, and find awesome tools for cropping, highlighting, etc. in the tool bar at the top of the page.
Windows Vista, 7, 8, 10: Use the Windows Snipping Tool (not sure how to use the Snipping Tool? Find a step-by-step guide here)
Older Windows versions: Press the “Print” key on your keyboard and edit the screenshot with Paint.
Keyboard commands on macOS are the fastest and most straightforward way to take a screenshot, both if you are capturing the entire screen or a selected portion of it:
For total screen captures: press cmd⌘ + L-Shift⇧ + 3
For screen section: key sequence cmd⌘ + L-Shift⇧ + 4
Home Button + On/Off-button (older Versions)
On/Off-button + volume down (newer Versions)
Although all Android phones are different, the above mentioned button sequences should do the job on most Android phones. The full list of different ways how to snap a screenshot on Android devices can be found here.
Taking a screenshot on your Apple Device is as easy as pressing two buttons (literally!):
Hold On/Off-button and tap the Home Button
After taking a screenshot, a thumbnail will appear in the lower left corner of the screen. Tap on it to start editing your screenshot with Apple's Markup tools.