Some shortcuts

Alt + F4 Close window
Alt + F5 Maximize window
Alt + F6 Maximize vertically
Alt + F7 Maximize horizontally
Alt + F8 Hide window
Alt + F9 Shade window
Alt + F10 Stick window
Alt + Tab Cycle windows focus
Ctrl + Shft + Alt + Arrow (up, down, left, or right) Move window
Shft + Alt + Arrow (up, down, left, or right) Resize window
Shft + Alt + Page_Up Raise window
Shft + Alt + Page_Down Lower window
Alt + F11 Toggle fullscreen
Ctrl + Alt + Arrow right arrow Next workspace
Ctrl + Alt + Arrow left Previous workspace
Alt + Insert Add a workspace
Alt + Delete Delete a workspace
Ctrl + F(N) Go to workspace number N (1-9)
Alt + Ctrl + Home|End Move the window to previous|next workspace
Alt + Ctrl + keypad key number N Move a window to workspace number N (1-9)
Alt + F1 Start xfhelp4
Alt + F2 Start xfrun4
Alt + Ctrl + Delete Lock the screen