Extend Selection to Start of Row

Using the Extend Selection to Start of Row Shortcut

Windows keyboard shortcut

 
Mac keyboard shortcut

Use this Excel shortcut to extend the current selection to the start of the row. The distance moved depends on size of the worksheet window.
Discover 242 Excel Keyboard Shortcuts for Windows and Mac
Other useful Extending Selection keyboard shortcuts
Extend Selection to the Last Cell Up
Extend Selection Up One Screen
Extend Selection Down One Screen
Extend Selection to First Cell in Worksheet
Extend Selection to the Last Cell Right