Screenshots can be very handy, you never know when you'll need one!
Press and hold the sleep/wake button
Immediately press the home button
Find the screenshot in the Camera Roll (Photos app > Albums > Camera roll)
Command-Shift-3 Capture the entire screen and save to a file (usually the desktop)
Command-Shift-Control-3 Capture the entire screen to the clipboard
Commnad-Shift-4 Capture a section of the screen to a file (press Spacebar to capture just a window)
Command-Shift-Control-4 Capture a section of the screen to the clipboard (press Spacebar to capture just a window)
Discover more Mac Keyboard Shortcuts
Just click 'new' - the default is set for "rectangular" snip - so click and drag to capture a portion of the screen. After you snip something, you have choices. You can draw with different pens, highlight, erase - then save to a file, copy to the clipboard, or send right to email. These options are also available on the "text" menu above the icons. From the menu, you have one additional option: File > Print.
[ File > Print ]
You also have more options for the type of snip you want to capture. Click on the ▼ dropdown next to New to reveal the choices - Free-form, Rectangular, Window, Full-screen.
As with most things, there are many ways to accomplish the same thing. Enjoy!
Oh - you might want to check out the Solution in the helpdesk for Keyboard shortcuts (Mac, Windows) - they are small "gifts" that can transform your relationship with your computer ; )