Select Active Cell Only

Using the Select Active Cell Only Shortcut

Windows keyboard shortcut

 
Mac keyboard shortcut

This Excel shortcut leaves only the active cell selected when multiple cells are selected.
Discover 242 Excel Keyboard Shortcuts for Windows and Mac
Other useful Active Cell keyboard shortcuts
Show Active Cell on Worksheet
Move Active Cell Clockwise in Selection
Move Active Cell Down in Selection
Move Active Cell Up in Selection
Move Active Cell Right in Selection