Exceljet

Quick, clean, and to the point

Get help on selected control

Windows shortcut 
F1

This shortcut gets help for a selected control on the ribbon.

No Mac equivalent.

I think your website is great! It has helped me so much in learning to how to do things in Excel, please keep up the excellent work. -Stuart
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