Macs are more shortcuts-driven, with the new user able to do many things very comfortably through clever use of the keyboard. In Mac the Command key replaces the function of the Ctrl key on a Windows keyboard. There is no Windows key and in its place is the Alt key. The Alt key is on a keyboard so simply use your thumb rather than your finger to start using shortcuts. The Ctrl and Shift keys are in the same places.
There are lot of widely used Windows shortcuts that are replicated on a Mac, so Command+C is for copy, Command+V is for paste and Command+X is for cut. Learning these keys and making full use of them is a great time saving tool.
Mac keyboard shortcuts make is very easy for you to take screenshots of areas on your desktop. Unlike the Print Screen button for Windows, you can simply hit the key Command+Shift+4 and your cursor will change to a crosshair that you can use to drag a box. This is very easy and Windows lacks such an easy method.