How do I quit/exit all windows/buffers/splits/tabs at once in Vim or vimdiff? [duplicate]

:qa quits all open windows/buffers/splits/tabs
(aliases: :qall :quitall)

Vim documentation for :qa

For help on this command in Vim: :help :qa

:qa! will quit without giving an option to save if it’s modified.
:wqa will write all changed buffers and then quit.
:wqa! will write all changed buffers, even readonly ones, and then quit.