back where I came from

While editing, I am often jumping place to place in the file for any number of resons. Getting back to where I started used to mean setting a mark with “m.” so that I could find my way back with “`.“. It turns out that VIM has something already built in to solve this problem.

from vimtutor:

5.To go back to where you came from press  CTRL-O  (Keep Ctrl down while

     pressing the letter o).  Repeat to go back further.  CTRL-I goes forward.

…very handy!