Transform Again

Don't be fooled by the shortcut for this command: Command-D (PC: Control-D). In many applications that's the shortcut for Duplicate, but not in Illustrator. In this program the command is called Transform Again, and it's quite different from duplicating (in a very good way). Transform Again is a shorter way of saying, "Whatever you just did, do it again." So if you just rotated an object 30°, pressing Command-D (PC: Control-D) will rotate the object another 30°. The object will not be duplicated unless that's part of the original transformation. For example, if you drag an object with the Option key (PC: Alt key) held down to move a copy, Transform Again will move another copy the exact same distance and angle. This is an extremely powerful command that has many uses! (Just remember not to do any additional operation, or you will alter your Transform Again command.)