I was used to capture screen with Windows OS by just using Print Screen button then paste it to MSPaint and voila you can save it, but with Mac OS I have to search to do this simple screen capture.
For you newbies of Mac OS like me, here’s how to capture a screen image in Safari Web Browser:
1. Press command + shift + 4.
2. Select the area of the screen you want.
3. The files go to desktop, and you can use the Preview application to convert the captured image to PDF & PNG.
If you’d like to capture the whole screen, use command + shift + 3.
Another tip to capture single windows on your screen, press command + shift + 4 + space bar.