⌘ 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 + 4 + ␣ Space – select window
⌘ Command + ⇧ Shift + 5 – capture or record screen