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You can save a selection to a channel (Select→Save to Channel) and then modify this channel with any paint tools. Using the buttons in the Channels dialogue, you can toggle the visibility of this new channel or convert it to a selection.

After you enabled "Dynamic Keyboard Shortcuts" in the Preferences dialogue, you can reassign shortcut keys. Do so by bringing up the menu, selecting a menu item and pressing the desired key combination. If "Save Keyboard Shortcuts" is enabled, the key bindings are saved when you exit GIMP. You should probably disable "Dynamic Keyboard Shortcuts" afterwards, to prevent accidentally assigning/reassigning shortcuts.

If your screen is too cluttered, you can press <tt>Tab</tt> in an image window to toggle the visibility of the toolbox and other dialogues.

<tt>Shift</tt>-click on the eye icon in the Layers dialogue to hide all layers but that one. <tt>Shift</tt>-click again to show all layers.

<tt>Ctrl</tt>-clicking on the layer mask's preview in the Layers dialogue toggles the effect of the layer mask. <tt>Alt</tt>-clicking on the layer mask's preview in the Layers dialogue toggles viewing the mask directly.

You can use <tt>Ctrl</tt>-<tt>Tab</tt> to cycle through all layers in an image (if your window manager doesn't trap those keys...).

<tt>Ctrl</tt>-click with the Bucket Fill tool to have it use the background colour instead of the foreground colour. Similarly, <tt>Ctrl</tt>-clicking with the eyedropper tool sets the background colour instead of the foreground colour.

<tt>Ctrl</tt>-drag with the Rotate tool will constrain the rotation to 15 degree angles.

If some of your scanned photos do not look colourful enough, you can easily improve their tonal range with the &quot;Auto&quot; button in the Levels tool (Colours→Levels). If there are any colour casts, you can correct them with the Curves tool (Colours→Curves).