Reset Your Dock

If you have been tinkering with the icons on your Dock on your Mac and other Dock settings and wish to start over with the default set of shortcuts, you can do so by typing two lines in the Terminal app. First type “defaults delete” — that will clear your Dock preferences. Then type “killall Dock” — that will restart the Dock. Note that you need to capitalize the D for it to work as Terminal commands are case-sensitive.