Below are a few options to take a screen shot on your Mac, the files should be on your desktop once you have taken them.
To take a screenshot on a Mac, use keyboard shortcuts: Command-Shift-3 for the full screen, Command-Shift-4 to select an area, or Command-Shift-5 for advanced options like recording. Screenshots are saved as PNG files to the desktop by default.
Key Screenshot Shortcuts
Entire Screen: Press𝐂𝐨𝐦𝐦𝐚𝐧𝐝+𝐒𝐡𝐢𝐟𝐭+𝟑
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Selected Portion: Press𝐂𝐨𝐦𝐦𝐚𝐧𝐝+𝐒𝐡𝐢𝐟𝐭+𝟒, then click and drag the crosshair.
Specific Window: Press𝐂𝐨𝐦𝐦𝐚𝐧𝐝+𝐒𝐡𝐢𝐟𝐭+𝟒, then press the Space bar.
Screenshot Tool/Menu: Press𝐂𝐨𝐦𝐦𝐚𝐧𝐝+𝐒𝐡𝐢𝐟𝐭+𝟓