Use these “finder” keyboard shortcuts.
Command+A — Select all items in the front Finder window (or desktop if no window is open)
Option+Command+A — Deselect all items
Shift+Command+A — Open the Applications folder
Command+C — Copy selected item/text to the Clipboard
Shift+Command+C — Open the Computer window
Command+D — Duplicate selected item
Shift+Command+D — Open desktop folder
Command+E — Eject
Command+F — Find any matching Spotlight attribute
Shift+Command+F — Find Spotlight file name matches
Option+Command+F — Navigate to the search field in an already+open Spotlight window
Shift+Command+G — Go to Folder
Shift+Command+H — Open the Home folder of the currently logged+in user account
Command+I — Get Info
Option+Command+I — Show Inspector
Control+Command+I — Get Summary Info
Shift+Command+I — Open iDisk
Command+J — Show View Options
Command+K — Connect to Server
Shift+Command+K — Open Network window
Command+L — Make alias of the selected item
Command+M — Minimize window
Option+Command+M — Minimize all windows
Command+N — New Finder window
Shift+Command+N — New folder
Option+Command+N — New Smart Folder
Command+O — Open selected item
Shift+Command+Q — Log Out
Option+Shift+Command+Q — Log Out immediately
Command+R — Show original (of alias)
Command+T — Add to Sidebar
Shift+Command+T — Add to Favorites
Option+Command+T — Hide Toolbar / Show Toolbar in Finder windows
Shift+Command+U — Open Utilities folder
Command+V — Paste
Command+W — Close window
Option+Command+W — Close all windows
Command+X — Cut
Option+Command+Y — Slideshow (Mac OS X 10.5 or later)
Command+Z — Undo / Redo
Command+1 — View as Icon
Command+2 — View as List
Command+3 — View as Columns
Command+4 — View as Cover Flow (Mac OS X 10.5 or later)
Command+, (Command and the comma key) — Open Finder preferences
Command+` (the Grave accent key++above Tab key on a US English keyboard layout) — Cycle through open Finder windows
Command+Shift+? — Open Mac Help
Option+Shift+Command+Esc (hold for three seconds) — Mac OS X v10.5, v10.6 or later only — Force Quit front+most application
Command+[ — Back
Command+] — Forward
Command+Up Arrow — Open enclosed folder
Control+Command+Up Arrow — Open enclosed folder in a new window
Command+Down Arrow — Open highlighted item
Command+Tab — Switch application++cycle forward
Shift+Command+Tab — Switch application++cycle backward
Command+Delete — Move to Trash
Shift+Command+Delete — Empty Trash
Option+Shift+Command+Delete — Empty Trash without confirmation dialog
Spacebar (or Command+Y) — Quick Look (Mac OS X 10.5 or later)
Command key while dragging — Move dragged item to other volume/location (pointer icon changes while key is held++see this article)
Option key while dragging — Copy dragged item (pointer icon changes while key is held++see this article)
Option+Command key combination while dragging — Make alias of dragged item (pointer icon changes while key is held++see this article)