Looking at this panel, you also can click on the keyboard shortcuts button and change the default keys for many menu functions and actions. There is also a PDF of the shortcuts which can be downloaded from the Scribus website. Below are the English defaults, all of which can be changed.
See also: Mouse Usage Hints
Ctrl + S = Saves Document
Ctrl + W = Close Document
Ctrl + O = Open Existing Document
Ctrl + P = Open Print Dialog
Ctrl + I = Show Document Info
Ctrl + Q = Quit Scribus
Ctrl + C = Copy
Ctrl + V = Paste
Ctrl + X = Cut
Ctrl + K = Delete
Ctrl + A = Select all
Ctrl + Z = Undo
Ctrl + L = Align Left
Ctrl + E = Align Center
Ctrl + R = Align Right
Ctrl + D = Duplicate Object
Ctrl + G = Group Objects
Ctrl + U = Ungroup Objects
Ctrl + H = Lock / Unlock Objects
Ctrl + 1 = Actual Size 100%
Ctrl + 0 = Fit in Window
F10 toggles on and off all palettes
F11 toggles on and off all guides, frames and grids.
Alt + - = "Smart" Hyphen
Ctrl + # = Insert Page Number ** Depending on your keyboard layout you should change this default to an F key. I use F7. For 10-99 pages, use Ctrl + ##, for 100-999 pages, use Ctrl + ###
F12 = Insert Special Unicode Character as Hex e.g 0020
when editing a text frame on the page.
Shift + Left Click = Selecting more than one object.
Shift+Cursor Key selects Characters
Ctrl+Shift+Cursor Key selects Words
Ctrl+Cursor Up/Down selects Lines
Ctrl+Home selects Text from the Start to the Cursor Position
Ctrl+End selects Text from the Cursor Position to the End
Ctrl+Cursor Key moves to the next Word
Home moves to the beginning of the line
End moves to the end of the line
Ctrl+Shift+Click selects the Object beneath another
Shift+Click adds an Object to the Selection
Ctrl+Alt+Click selects a single Object out of a Groups
Overlapping objects - Control shift select any frame on any level on one layer to select it. Then to move or resize the frame you have selected, hold down control.
You can constrainobjects when re-sizing them with Ctrl-drag. Constraining keeps the aspect ratio the same as the original shape.