It is very easy to customize these shortcuts and add many more shortcuts by going to System Preferences - Keyboard Shortcuts
win or alt+f1
Open the Overview, showing all workspaces and windows.
Cycle through open windows. Add shift to cycle in the reverse direction.
Cycle through open windows of a single application (while alt+tab switcher is open).
Cycle through open windows without invoking the alt+tab switcher.
Cycle through open windows of a single application without invoking the alt+tab switcher
ctrl+alt+arrow up/arrow down
Move to workspace up/down
ctrl+alt+shift+arrow up/arrow down
Move current window to workspace up/down
Open a command dialog box.
Hold alt while selecting the "Suspend" item in the user menu (upper right) to display the "Shut Down" option.
Take a screenshot of the current view.
Take a screenshot of the current window.
Begin recording a screencast. (may not be supported in all distributions)
Close current window.
Restore/Unmaximize current window (if maximized)
alt+f7 or alt+drag
Move current window. Use mouse or arrow keys to move, then press any key or click the mouse to finish.
alt+f8 or alt+middle click drag
Resize current window. Use mouse or arrow up/arrow down to resize, then press any key or click the mouse to finish.
Open the window menu.
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