Screenshots are an easy way to capture your screen (or part of it).
Take a Screenshot of the WHOLE SCREEN
Ctrl + Switcher (the rectangle with the two lines to the right in your top row) takes a screenshot of your Chromebook screen and saves it to either your Downloads folder or Google Drive.
Ctrl + Shift + Switcher will change your cursor (or mouse pointer) to cross hairs.
Move the cross hair to one corner of the area you want to capture.
Click the mouse or touch pad and move to the opposite corner you want to capture. When you have the area selected, release the mouse or touch pad.
The section will automatically be saved to either your Downloads folder or Google Drive.
Take a Screenshot of the WHOLE MAC SCREEN
CMD + Shift + 3 takes a screenshot of your whole screen and saves it either to your desktop or your downloads folder (you can change this)
CMD+ Shift + 4 will change your cursor (or mouse pointer) to cross hairs.
Move the cross hairs to one corner of the area you want to capture.
Click the mouse or touch pad and move to the opposite corner you want to capture. When you have the area selected, release the mouse or touch pad.
The section will automatically be saved to either your Desktop or Downloads folder.