⌘ Command + A – select all

⌘ Command + C – copy

⌘ Command + V – paste

⌘ Command + X – cut

⌘ Command + Z – undo

⌘ Command + H – hide

⌘ Command + N – new

⌘ Command + P – print

⌘ Command + F – find

⌘ Command + G – find next

⌘ Command + M – minimize

⌘ Command + ⌥ Option + M + H – minimize all

⌘ Command + Q – quit app

⌘ Command + D – bookmark

⌘ Command + O – open a file

⌘ Command + R – reload page

⌘ Command + S – save

⌘ Command + ⇧ Shift + S – save as

⌘ Command + W – close tab

⌘ Command + T – open tab

⌘ Command + +/- – zoom

⌘ Command + 0 – reset zoom

⌘ Command + , – app settings

⌘ Command + ␣ Space – spotlight search

⌘ Command + ⌥ Option + D – show/hide dock

⌘ Command + ⌃ Control + Space – emoji

⌘ Command + ⌃ Control + Q – lock screen

⌘ Command + ⇥ Tab – switch between apps

⌘ Command + ⇧ Shift + T – reopen closed tab

⌃ Control + ↑ Up arrow – view Mission Control

⌘ Command + ⌥ Option + ⎋ Escape – force quit an app

⌘ Command + ⇧ Shift + Q – instant logout

⌘ Command + ⌥ Option + ⌃ Control + Power – force shutdown

Finder:

⌘ Command + ⇧ Shift + C – computer

⌘ Command + ⇧ Shift + H – home

⌘ Command + ⇧ Shift + I – iCloud

⌘ Command + ⇧ Shift + A – applications

⌘ Command + ⇧ Shift + F – recents

⌘ Command + ⇧ Shift + G – go to folder

Screenshots:

⌘ Command + ⇧ Shift + 3 – full screen

⌘ Command + ⇧ Shift + 4 – select area

⌘ Command + ⇧ Shift + 5 – capture or record screen