I just started using emacs after having used vi for a long time. :)
One thing which is annoying me is that whenever I modify a file, save it and exit emacs, I see a back
Here is a link to the same question answered on SuperUser and my response. And a StackOverflow question entitled Emacs: Don’t create #these# files when not saving modified buffer
And for completeness, as stated by others; to stop the backup files being created put this in your .emacs
(setq make-backup-files nil)