Here are some samples and examples are taken from different .htaccess files We've used over the years. 

Example #1

# Set the Time Zone of your Server
SetEnv TZ America/Indianapolis

# ServerAdmin:  This address appears on some server-generated pages, such as error documents.
SetEnv SERVER_ADMIN webmaster@YourDomain.com

# Possible values for the Options directive are "None", "All", or any combination of:
#  Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews
Options -ExecCGI -MultiViews -Includes -Indexes FollowSymLinks

# DirectoryIndex: sets the file that Apache will serve if a directory is requested.
DirectoryIndex index.html index.php /index.php

# Action lets you define media types that will execute a script whenever
# a matching file is called. This eliminates the need for repeated URL
# pathnames for oft-used CGI file processors.
# Format: Action media/type /cgi-script/location
# Format: Action handler-name /cgi-script/location
#
Action php5-cgi /bin/php.cgi

# AddHandler allows you to map certain file extensions to "handlers":
# actions unrelated to filetype. These can be either built into the server
# or added with the Action directive (see below)
#
# To use CGI scripts outside of ScriptAliased directories:
# (You will also need to add "ExecCGI" to the "Options" directive.)
#
AddHandler php-cgi .php .inc

# Commonly used filename extensions to character sets.
AddDefaultCharset UTF-8

# AddType allows you to add to or override the MIME configuration
AddType 'application/rdf+xml; charset=UTF-8' .rdf
AddType 'application/xhtml+xml; charset=UTF-8' .xhtml
AddType 'application/xhtml+xml; charset=UTF-8' .xhtml.gz
AddType 'text/html; charset=UTF-8' .html
AddType 'text/html; charset=UTF-8' .html.gz
AddType application/octet-stream .rar .chm .bz2 .tgz .msi .pdf .exe
AddType application/vnd.ms-excel .csv
AddType application/x-httpd-php-source .phps
AddType application/x-pilot .prc .pdb
AddType application/x-shockwave-flash .swf
AddType application/xrds+xml .xrdf
AddType text/plain .ini .sh .bsh .bash .awk .nawk .gawk .csh .var .c .in .h .asc .md5 .sha .sha1
AddType video/x-flv .flv

# AddEncoding allows you to have certain browsers uncompress information on the fly. Note: Not all browsers support this.
AddEncoding x-compress .Z
AddEncoding x-gzip .gz .tgz

# DefaultType: the default MIME type the server will use for a document.
DefaultType text/html

# Optionally add a line containing the server version and virtual host
# name to server-generated pages (internal error documents, FTP directory
# listings, mod_status and mod_info output etc., but not CGI generated
# documents or custom error documents).
# Set to "EMail" to also include a mailto: link to the ServerAdmin.
# Set to one of:  On | Off | EMail
ServerSignature Off

Example #2

## MAIN DEFAULTS
Options +ExecCGI -Indexes
DirectoryIndex index.html index.htm index.php
DefaultLanguage en-US
AddDefaultCharset UTF-8
ServerSignature Off

## ENVIRONMENT VARIABLES
SetEnv PHPRC /webroot/includes
SetEnv TZ America/Indianapolis

SetEnv SERVER_ADMIN webmaster@YourDomain.com

## MIME TYPES
AddType video/x-flv .flv
AddType application/x-shockwave-flash .swf
AddType image/x-icon .ico

## FORCE FILE TO DOWNLOAD INSTEAD OF APPEAR IN BROWSER
# http://www.YourDomain.com/addtype-addhandler-action.html
AddType application/octet-stream .mov .mp3 .zip

## ERRORDOCUMENTS
# http://YourDomain.com/htaccess/apache-status-code-headers-errordocument.html
ErrorDocument 400 /e400/
ErrorDocument 401 /e401/
ErrorDocument 402 /e402/
ErrorDocument 403 /e403/
ErrorDocument 404 /e404/

# Handlers be builtin, included in a module, or added with Action directive
# default-handler: default, handles static content (core)
#   send-as-is: Send file with HTTP headers (mod_asis)
#   cgi-script: treat file as CGI script (mod_cgi)
#    imap-file: Parse as an imagemap rule file (mod_imap)
#   server-info: Get server config info (mod_info)
#  server-status: Get server status report (mod_status)
#    type-map: type map file for content negotiation (mod_negotiation)
#  fastcgi-script: treat file as fastcgi script (mod_fastcgi)
#
# https://www.YourDomain.com/php/custom-phpini-tips-and-tricks/

## PARSE AS CGI
AddHandler cgi-script .cgi .pl .spl

## RUN PHP AS APACHE MODULE
AddHandler application/x-httpd-php .php .htm

## RUN PHP AS CGI
AddHandler php-cgi .php .htm

## CGI PHP WRAPPER FOR CUSTOM PHP.INI
AddHandler phpini-cgi .php .htm
Action phpini-cgi /cgi-bin/php5-custom-ini.cgi

## FAST-CGI SETUP WITH PHP-CGI WRAPPER FOR CUSTOM PHP.INI
AddHandler fastcgi-script .fcgi
AddHandler php-cgi .php .htm
Action php-cgi /cgi-bin/php5-wrapper.fcgi

## CUSTOM PHP CGI BINARY SETUP
AddHandler php-cgi .php .htm
Action php-cgi /cgi-bin/php.cgi

## PROCESS SPECIFIC FILETYPES WITH CGI-SCRIPT
Action image/gif /cgi-bin/img-create.cgi

## CREATE CUSTOM HANDLER FOR SPECIFIC FILE EXTENSIONS
AddHandler custom-processor .ssp
Action custom-processor /cgi-bin/myprocessor.cgi

### HEADER CACHING
# https://www.YourDomain.com/htaccess/speed-up-sites-with-htaccess-caching/
<FilesMatch "\.(flv|gif|jpg|jpeg|png|ico)$">
Header set Cache-Control "max-age=2592000"
</FilesMatch>
<FilesMatch "\.(js|css|pdf|swf)$">
Header set Cache-Control "max-age=604800"
</FilesMatch>
<FilesMatch "\.(html|htm|txt)$">
Header set Cache-Control "max-age=600"
</FilesMatch>
<FilesMatch "\.(pl|php|cgi|spl|scgi|fcgi)$">
Header unset Cache-Control
</FilesMatch>

## ALTERNATE EXPIRES CACHING
# htaccesselite.com/d/use-htaccess-to-speed-up-your-site.html
ExpiresActive On
ExpiresDefault A604800
ExpiresByType image/x-icon A2592000
ExpiresByType application/x-javascript A2592000
ExpiresByType text/css A2592000
ExpiresByType text/html A300

<FilesMatch "\.(pl|php|cgi|spl|scgi|fcgi)$">
ExpiresActive Off
</FilesMatch>

## META HTTP-EQUIV REPLACEMENTS
<FilesMatch "\.(html|htm|php)$">
Header set imagetoolbar "no"
</FilesMatch>

Examples #3 (Default MOD_REWRITE Code)

## REWRITE DEFAULTS
RewriteEngine On
RewriteBase /

## REQUIRE SUBDOMAIN
RewriteCond %{HTTP_HOST} !^$
RewriteCond %{HTTP_HOST} !^subdomain\.YourDomain\.com$ [NC]
RewriteRule ^/(.*)$ http://subdomain.YourDomain.com/$1 [L,R=301]

## SEO REWRITES
RewriteRule ^(.*)/ve/(.*)$ $1/voluntary-employee/$2 [L,R=301]
RewriteRule ^(.*)/hsa/(.*)$ $1/health-saving-account/$2 [L,R=301]

## WORDPRESS
RewriteCond %{REQUEST_FILENAME} !-f  # Existing File
RewriteCond %{REQUEST_FILENAME} !-d  # Existing Directory
RewriteRule . /index.php [L]

## ALTERNATIVE ANTI-HOTLINKING
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(subdomain\.)?askapache\.com/.*$ [NC]
RewriteRule ^.*\.(bmp|tif|gif|jpg|jpeg|jpe|png)$ - [F]

## REDIRECT HOTLINKERS
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(subdomain\.)?YourDomain\.com/.*$ [NC]
RewriteRule ^.*\.(bmp|tif|gif|jpg|jpeg|jpe|png)$ http://google.com [R]

## DENY REQUEST BASED ON REQUEST METHOD
RewriteCond %{REQUEST_METHOD} ^(TRACE|TRACK|OPTIONS|HEAD)$ [NC]
RewriteRule ^.*$ - [F]

## REDIRECT UPLOADS
RewriteCond %{REQUEST_METHOD} ^(PUT|POST)$ [NC]
RewriteRule ^(.*)$ /cgi-bin/form-upload-processor.cgi?p=$1 [L,QSA]

## REQUIRE SSL EVEN WHEN MOD_SSL IS NOT LOADED
RewriteCond %{HTTPS} !=on [NC]
RewriteRule ^.*$ https://%{SERVER_NAME}%{REQUEST_URI} [R,L]

### ALTERNATATIVE TO USING ERRORDOCUMENT
# http://www.htaccesselite.com/d/htaccess-errordocument-examples-vt11.html
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^.*$ /error.php [L]

## SEO REDIRECTS
Redirect 301 /2006/oldfile.html http://subdomain.YourDomain.com/newfile.html
RedirectMatch 301 /o/(.*)$ http://subdomain.YourDomain.com/s/dl/$1

Example #4 (Protecting your files and securing with password protection)

#
# Require (user|group|valid-user) (username|groupname)
#
## BASIC PASSWORD PROTECTION
AuthType basic
AuthName "prompt"
AuthUserFile /.htpasswd
AuthGroupFile /dev/null
Require valid-user

## ALLOW FROM IP OR VALID PASSWORD
Require valid-user
Allow from 192.168.1.23
Satisfy Any

## PROTECT FILES
<FilesMatch "\.(htaccess|htpasswd|ini|phps|fla|psd|log|sh)$">
Order Allow,Deny
Deny from all
</FilesMatch>

## PREVENT HOTLINKING
SetEnvIfNoCase Referer "^http://subdomain.YourDomain.com/" good
SetEnvIfNoCase Referer "^$" good
<FilesMatch "\.(png|jpg|jpeg|gif|bmp|swf|flv)$">
Order Deny,Allow
Deny from all
Allow from env=good
ErrorDocument 403 http://www.google.com/intl/en_ALL/images/logo.gif
ErrorDocument 403 /images/you_bad_hotlinker.gif
</FilesMatch>

## LIMIT UPLOAD FILE SIZE TO PROTECT AGAINST DOS ATTACK
#bytes, 0-2147483647(2GB)
LimitRequestBody 10240000

## MOST SECURE WAY TO REQUIRE SSL
# https://www.YourDomain.com/htaccess/apache-ssl-in-htaccess-examples/
SSLOptions +StrictRequire
SSLRequireSSL
SSLRequire %{HTTP_HOST} eq "askapache.com"
ErrorDocument 403 https://YourDomain.com

## COMBINED DEVELOPER HTACCESS CODE-USE THIS
<FilesMatch "\.(flv|gif|jpg|jpeg|png|ico|js|css|pdf|swf|html|htm|txt)$">
Header set Cache-Control "max-age=5"
</FilesMatch>
AuthType basic
AuthName "Ooops! Temporarily Under Construction..."
AuthUserFile /.htpas