For years I’ve collected these keystrokes. I hope they help you become the power user that lies within. They have been tested in Mac OS X Yosemite (Mac OS 10.10) but most should work on other versions of Mac OS (10.9 Mavericks, 10.8 Mountain Lion, 10.7 Lion, etc.). Finder Action Keystroke Open Sidebar item in a new Tab or Window (depending on Finder Preferences) Cmd-Click Switch Finder views (Icon, List, Column, Cover Flow) Cmd-1, Cmd-2, Cmd-3, Cmd-4 In List view, expand a folder Right Arrow In List view, collapse a folder Left Arrow Rename the selected file/folder Press Return (or Enter) Go into selected folder or open the selected file Cmd-Down Arrow Go to parent folder Cmd-Up Arrow Go Back Cmd-[ Go Forward Cmd-] Select the next icon in Icon and List views Tab (Shift-Tab reverses direction) Alternate columns in Column View Tab (Shift-Tab reverses direction) Resize one column to fit the longest file name (Column View) Double...