Holding Option (⌥) while having menus open or clicking items in the menu bar will give you additional menu items or alternate menus.
As an example the alternate wifi control menu let you see your IP- and router-address.
Additional menu items or alternate menus
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Resize a window while holding down the Option key
Resize a window while holding down the Option key to resize the window from the center Press Shift to keep the aspect ratio.
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9 Mac Tips and Shortcuts You Should Know
Useful Mac tricks including window management, Spotlight shortcuts, trackpad gestures, and system preferences tips