OS X Mavericks: Windows keys on a Mac keyboard

A Mac keyboard has many keys that function the same as keys on a Windows keyboard. Here are some of them:

Windows key	Mac key	Use
Forward delete	⌦ Fn-Delete	Deletes the character to the right. On portable Macs, press Fn-Delete.
Alt	Option	Enters special characters, such as é.
Control Windows key	Command (⌘)	Performs actions or shortcuts. For example, pressing Command (⌘)-S usually saves a document or file.
Home and End	Command (⌘)-Left Arrow and Command (⌘)-Right Arrow	On the Mac, use the Command and arrow keys to go to the beginning or end of the current line, and use the Home and End keys to go to the beginning or end of the current document.
Num lock	Num lock Shift-Clear	In some apps, controls whether pressing keys in the numeric keyboard enters numbers or moves the cursor.
Scroll Lock	Control-F14	In some apps, controls whether pressing the arrow keys moves the cursor or scrolls in a window.
Print Screen	Shift-Command (⌘)-3 Shift-Command (⌘)-4	Takes pictures of the screen. Shift-Command (⌘)-3 takes a picture of the entire screen. Shift-Command (⌘)-4 takes a picture of the part of the screen you select.

Pressing the Option key while viewing a menu reveals hidden menu items. For example, in many apps, if you press the Option key while viewing the File menu, File > Close changes to File > Close All.