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To take a screenshot on a Apple Mac book, you can follow the given keyboard shortcuts process, This is very important to follow the instruction step by step.
Command + Shift + 3
This is the very easy way to take screenshot on Mac to capture the entire screen, first press Command + Shift + 3 and the screenshot will be saved to your desktop or you can also save the save location manually. You can refer the below image.

Command + Shift + 4
For capture a specific area of the screen on Mac, you can press Command + Shift + 4. Your cursor will turn into a crosshair. You can click and drag the crosshair to select the area you want to capture. And finally just release the mouse button to take the screenshot. The screenshot will be saved to your desktop and you can also save the capture by your own. You can refer the below link for better understanding,

Shift + 4 + Spacebar
For capture a specific window, press Command + Shift + 4 + Spacebar. Your cursor will turn into a camera icon. Then click on the window you want to capture. The screenshot will be saved to your desktop you can also save the capture by your own.
Use Grab Application for take screenshot
You can also down the Grab app on your Mac to take screenshots from Apple store, which provides more options and control over the screenshot process.
Please ask the question if you have.