Learn how to find handy keyboard shortcuts by simply looking in the menu at the top of the screen. Also look in System Preferences for more shortcuts. You can change the shortcut used by many system functions. You can also create your own custom keyboard shortcuts. Download and print out MacMost's handy keyboard shortcut guide at http://macmost.com/j-keyshort.
Thanks for the tip, Gary. Very useful. As far as I know, you never had the opportunity to change keyboard shortcuts in Windows.
Extremely useful. I didn't know about creating custom shortcuts per app. Thanks, Gary!