OS Shortcut

Properties	Command
Screenshot of part of the screen	`Command-Shift-4`
Screenshot of whole screen	`Command-Shift-3`
Go to desktop	`fn f11`
Force Quit application	`Command-Option-Esc`
To show minimized app with ⌘ Cmd + ⇥ Tab	Hold ⌘ Cmd. press ⇥ Tab until you've selected the app press the ⌥ Option, and let go of the ⌘ Cmd. ( You must release ⌘ Cmd after pressing ⌥ Option ! )
Mac's task manager - Activity monitor	CMD + space , search for activity monitor
Change dock to other screen	CMD + space > Dock > "Position on screen:" click "Left" and the doc will move back to the main monitor. You can then click "Bottom" and the doc will move to the bottom.
Open inspect element on chrome	CMD + OPT + J