Copy: Select the text 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: Paste with Command (⌘) + Shift + V
Copy using right-click: Select item → right-click → choose Copy
Paste using right-click: Right-click where you want it → choose Paste
Copy from menu bar: Select item → Edit → Copy
Paste from menu bar: Place cursor → Edit → Paste
Copy/Paste with trackpad gestures (if enabled): Use two-finger tap/right-click and select Copy/Paste
Copy/Paste files in Finder: Select files → Command (⌘) + C → open destination folder → Command (⌘) + V
Cut files in Finder: Select files → Command (⌘) + X → open destination folder → Command (⌘) + Option (⌥) + V