1b Keyboard Shortcuts
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Even if you are used to using menus rather than keyboard shortcuts in other programs, it is worth getting into the habit of using keyboard shortcuts for common operations in the GIMP, for they can save you a lot of time. Here are the shortcuts that I recommend you learn NOW - try to use them systematically rather than using menus. The shortcuts for zooming in and out are particularly useful - it's important to realize that zooming doesn't actually change the size of the picture, any more than looking at a bird through binoculars makes the bird bigger - it just seems bigger.
 
Ctrl-S Save Image
Ctrl-N New Image
Ctrl-O Open Image
Ctrl-E Shrink Wrap
Ctrl-W Close Window
Ctrl-X Close Program
1 Set View to 1:1
Ctrl-Z Undo last action
Ctrl-Y Redo
+ (on main keypad, not numeric keypad) Zoom in
- (on main keypad, not numeric keypad) Zoom out
F1 Help
Shift-F1 Context-sensitive Help

There are easy shortcuts also for most of the selection, paint and transform tools - see the Tools menu to identify them. It's not worth trying to remember all those tool shortcuts but it might be worth memorizing those that you use very often.

It's fairly easy (in File>Preferences>Interface>Configure Keyboard Shortcuts) to set up your own keyboard shortcuts for any command that you use often.

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