I really knew nothing about the htaccess file before meet this htaccess online editor. You can restrict folders, change the initial page name or extension.

A simple htaccess document that i was never wrote and today i made my first in two minutes:

<files  ?^.(htaccess|htpasswd)$? ~>deny from all
Options -Indexes
ErrorDocument 400 400.htm
ErrorDocument 401 401.htm
ErrorDocument 403 403.htm
ErrorDocument 404 404.htm
ErrorDocument 500 500.htm
DirectoryIndex default.php index.php init.php
order deny,allow
deny from restrict.php

Really good to try.
Link: http://www.htaccesseditor.com