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### 1.4 What are `src/config.h`, `site-lisp/default.el`, etc.?

These are files that come with Emacs. The Emacs distribution is divided into subdirectories; e.g., `etc`, `lisp`, and `src`. Some of these (e.g., `etc` and `lisp`) are present both in an installed Emacs and in the sources, but some (e.g., `src`) are only found in the sources.

If you use Emacs, but don’t know where it is kept on your system, start Emacs, then type `C-h v data-directory RET`. The directory name displayed by this will be the full pathname of the installed `etc` directory. (This full path is recorded in the Emacs variable `data-directory`, and `C-h v` displays the value and the documentation of a variable.)

The location of your Info directory (i.e., where Info documentation is stored) is kept in the variable `Info-default-directory-list`. Use `C-h v Info-default-directory-list RET` to see the value of this variable, which will be a list of directory names. The last directory in that list is probably where most Info files are stored. By default, Emacs Info documentation is placed in `/usr/local/share/info`.

For information on some of the files in the `etc` directory, see Informational files for Emacs.