how to take screenshot in macbook

For the whole screen: Shift-Command 3

1. For part of the screen: Press Shift-Command (⌘)-4.
2. Drag the crosshair pointer to select the area.Continue to press the mouse or trackpad button, release the keys, then press Shift, Option, or the Space bar while you drag to resize the selection area.
3. When you are ready to take a picture, release the mouse button.

To cancel, press Escape before you release the mouse button.

Taking Screenshots in Mac OS X

• Command-Shift-3: Take a screenshot of the screen, and save it as a file on the desktop
• Command-Shift-4, then select an area: Take a screenshot of an area and save it as a file on the desktop
• Command-Shift-4, then space, then click a window: Take a screenshot of a window and save it as a file on the desktop
• Command-Control-Shift-3: Take a screenshot of the screen, and save it to the clipboard
• Command-Control-Shift-4, then select an area: Take a screenshot of an area and save it to the clipboard
• Command-Control-Shift-4, then space, then click a window: Take a screenshot of a window and save it to the clipboard

In Leopard and later, the following keys can be held down while selecting an area (via Command-Shift-4 or Command-Control-Shift-4):

• Space, to lock the size of the selected region and instead move it when the mouse moves
• Shift, to resize only one edge of the selected region
• Option, to resize the selected region with its center as the anchor point

Source: http://guides.macrumors.com/Taking_Screenshots_in_Mac_OS_X