First of all, here’s how to take a screenshot on Mac.

By default, macOS saves screenshots to the Desktop.

If you want to save your screenshot in a custom location, you can use this command:

defaults write com.apple.screencapture location ~/your/location/here

You now need to restart the system UI server, so run this command:

killall SystemUIServer

And that’s it. Screenshots will now be saved to your new location.

To change back to the default location you can run

defaults write com.apple.screencapture location ~/Desktop/

# Followed by
killall SystemUIServer