Open Sidebar item in a new Tab or Window (depending on Finder Preferences) Cmd-Click

Switch Finder views

(Icon, List, Column, Gallery) 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-Click column divider (or the resize widget at the bottom of the column divider, depending on your setup)

Resize all columns to fit their longest file names (Column View) Option Double-Click column divider (or the resize widget at the bottom of the column divider, depending on your setup)

Copy and Paste files Cmd-C, then Cmd-V

Copy and Paste files Exactly (Keeps original ownership & permissions. Requires Admin username & password.) Cmd-C, then Cmd-Option-Shift-V

Cut and Paste files (Move files) Cmd-C, then Cmd-Option–V

Copy a File's Pathname Cmd-Opt–C

Move a file instead of copying (Copies to the destination and removes it from the original disk.) Cmd-Drag file to disk

Immediately Delete a File (does not put file in Trash) Cmd-Opt–Delete

Move selected files to the Trash (called the Recycle Bin in Windows) Cmd-Delete

Empty the Trash with warning (like emptying Recycle Bin in Windows) Cmd-Shift-Delete

Empty the Trash with no warning (like emptying Recycle Bin in Windows) Cmd-Opt-Shift-Delete

Cancel a drag-n-drop action while in the midst of dragging Esc

Show Inspector (a single, live refreshing Info window) Cmd-Opt-I

Undo the last action (such as rename file, copy file, etc.) Cmd-Z

Toggle Hidden Files (Show Hidden Files or Hide Them). Also works in Open/Save dialogs! Cmd-Shift-Period(.)

May be a comma (,) instead of period for some languages.

Hide/Show Sidebar (on the left) Cmd-Opt-S

Hide/Show Toolbar (on the top) and the Sidebar Cmd-Opt-T

Move or Remove item in toolbar (at the top of the window). Works in most programs. Cmd-Drag

Open Quick Look (Previews most types of files without having to open them) Press the Spacebar (or Cmd-Y). On a trackpad can also tap with 3 fingers.

Zoom In/Out in Quick Look (Images & PDFs) Pinch on a trackpad or hold Opt while scrolling. For images, hold Option to zoom to 100%.