Exceljet

Quick, clean, and to the point

Extend selection to start of row

Windows shortcut 
ShiftHome
Mac shortcut 
Fn

The distance moved up depends on the size of the worksheet window.

This is the best Excel training site I have ever seen. -Kedy
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