Emacs has a very useful system for bookmarks – shortcuts to often-used files. It's also one of those features I only really started using after years of emacs – there seem to be many of such obvious features…
Bookmarks are especially handy if you have long file names, or for examples the special file names for editing root-owned files discussed here before.
To start using bookmarks effectively, there are only a few important key
bindings to memorize:
C-x r m ('make') will create a new bookmark,
defaulting to the current file. Then, you can jump to an existing bookmark
C-x r b ('bookmark') Finally, you can see the list of your bookmarks
C-x r l ('list').
There are a few customizations you can put in your
(setq bookmark-default-file "~/.emacs.d/bookmarks" ;; keep my ~/ clean bookmark-save-flag 1) ;; autosave each change)