Exceljet

Quick, clean, and to the point

Close Excel

Windows shortcut 
AltF4
Mac shortcut 
Q

This shortcut will close Excel.

On a Mac, you can use Command + Q to quit almost any application.

On Windows, you can use Alt + F4 for Excel. Also, you can press ALT + F followed by the X key.

This is the best site I have been to. Direct & to the point. You guys have (almost) everything I need on one site. -Carl
Excel foundational video course
Excel Pivot Table video training course
Excel formulas and functions video training course
Excel Shortcuts Video Course
Excel Charts video training course