Going to assume this wasnt one of your choices to get a MAC.
I had to go thru the pain of learning the small differences. Once you know what the ctlr-alt-del "Option-Command-Esc" and change the other crap from default like the genie bar and show as list instead of the grid, I was good.
I quickly got the hang of it and like the mac side vs window as a majority. Spacebar to preview is one of the best things besides the zoom feature.
Command is the propeller or on a non-mac KB the win-key.
Option is on the mac KB. Dont think I ever looked or remapped for option on non mac KB. I just plug one in if I JUST have to, rare.
Command-X
Cut the selected item and copy it to the Clipboard.
Command-C
Copy the selected item to the Clipboard. This also works for files in the Finder.
Command-V
Paste the contents of the Clipboard into the current document or app. This also works for files in the Finder.
Command-Z
Undo the previous command. You can then press Command-Shift-Z to
Redo, reversing the undo command. In some apps, you can undo and redo multiple commands.
Command-A
Select All items.
Command-F
Find items in a document or open a Find window.
Command-G
Find Again: Find the next occurrence of the item previously found. To find the previous occurrence, press Command-Shift-G.
Command-H
Hide the windows of the front app. To view the front app but hide all other apps, press Command-Option-H.
Command-M
Minimize the front window to the Dock. To minimize all windows of the front app, press Command-Option-M.
Command-N
New: Open an new document or window.
Command-O
Open the selected item, or open a dialog to select a file to open.
Command-P
Print the current document.
Command-S
Save the current document.
Command-W
Close the front window. To close all windows of the app, press Command-Option-W.
Command-Q
Quit the app.
Option-Command-Esc
Force Quit: Choose an app to
force quit. Or press Command-Shift-Option-Esc and hold for 3 seconds to force just the front app to quit.
Command–Space bar
Spotlight: Show or hide the
Spotlight search field. To perform a Spotlight search from a Finder window, press Command–Option–Space bar. If you
use multiple input sources to type in different languages, these shortcuts
change input sources instead of showing Spotlight.
Space bar
Quick Look: Use
Quick Look to preview the selected item.
Command-Tab
Switch apps: Switch to the next most recently used app among your open apps.
Shift-Command-Tilde (~)
Switch windows: Switch to the next most recently used window of the front app.
Shift-Command-3
Screenshot: Take a screenshot of the entire screen.
Learn more screenshot shortcuts.
Command-Comma (,)
Preferences: Open preferences for the front app.