In case you weren't aware of it, MacOS also has a `Shift + Cmd + 5` screenshot shortcut that allows for more configuration (save location; whether to capture the full screen, a window, or a specific area of the screen; and whether to capture an image or a video) - in particular, I find that the screen area capture is better than using `Shift + Cmd + 4`, because you can adjust where the edges of the box are before capturing, rather than needing to get spacing right in one go with the crosshairs.