Copy: select the text, file, or item
Press Command + C
Paste: place the cursor where you want it
Press Command + V
Cut: select the text or item
Press Command + X
Paste and match style: press Option + Shift + Command + V
Copy and paste with right-click: select the item, then choose Copy or Paste from the menu
Copy and paste with the Edit menu: click Edit, then choose Copy or Paste
Drag and drop files or text when supported