#####[ Keyboard Shortcuts ]#####

This is not a complete list, but here a few keyboard shortcuts that should help:

The follwoing should work anywhere:
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Ctrl+Alt+Backspace = Kill X and go to console
Ctrl+Alt+Del = Reboot computer

Quick tip:
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If a window is larger than your screen and maximzing is not an option or doing
so does not help, you can "slide" it up, so to speak, by holding down the Alt 
key and using the left-click on your mouse to move it but make sure the window 
is not maximazed first.

On JWM...
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Many of these keyboard shortcuts exist because they were set as one of the
right-click options for items on the desktop. However, the main way to change
keyboard shortcuts for JWM is to edit the "~/.jwm/jwmrc-personal" file.

Hyper = Windows Key on most keyboards or the "Command" key on an Apple keyboard

Hyper+h = File Manager
Hyper+t = Terminal
Hyper+Spacebar = 'gRun' or 'xfce4-appfinder' if using an i486 or i586 and newer
Hyper+c = 'xcalc' or 'galculator' if using an i486 or i586 and newer
Hyper+g = ColorPicker for choosing a color and then copies to clipboard
Hyper+l = Lock screen
Ctrl+Alt+F4 = Suspend
Ctrl+Alt+[Left/Right keys] = Switch workspaces
Hyper+s = Spellcheck selected text using a combination of 'xsel' and 'aspell'

ROX file manager keyboard shortcuts are your typical Ctrl+c and Ctrl+v, 
copy/paste stuff, but when in doubt, open the ROX file manager and click the
help button and read through the docs for some extras. Probably the most useful
shortcut for ROX is "/" for quickly searching and navigating through files and
directories; it also supports tab completion, but make sure to use Esc key when
finished if needing to use a right-click menu item on a file or folder.

On XFCE...
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Super = Windows Key on most keyboards or the "Command" key on an Apple keyboard

Super+h = File Manager
Super+t = Terminal
Super+Spacebar = 'gRun' or 'xfce4-appfinder' if using an i486 or i586 and newer
Super+c = 'xcalc' or 'galculator' if using an i486 or i586 and newer
Super+g = ColorPicker for choosing a color and then copies to clipboard
Super+l = Lock screen
Ctrl+Alt+F4 = Suspend
Ctrl+Alt+[Up/Down keys] = Switch workspaces
Super+s = Spellcheck selected text using a combination of 'xsel' and 'aspell'

You can easily set keyboard shortcuts for items on the JWM desktop by 
right-clicking them and selecting "Edit Item." XFCE has its own settings 
program you can use for setting keyboard shortcuts.