Vim: ZZ and zz: Do you know the difference?
Of all the z’s my favorite by far is Ctrl-z, which send the current application to sleep and drops you back to the terminal, where you can do whatever you need before using ‘fg’ to return the slept process to the foreground.<p>It works with everything but I use it with vi most of all.<p>You can even sleep as many processes as you like and choose which one to return to the foreground as needed.