The Best Way To Define .htaccess file

[vijay]

Hi,

I give the lines below, culled from various sources on how to define .htaccess file.

I am dividing them ( below ) into 4 parts for easy referencing.

1. AddHandler application/x-httpd-php .html

2. # BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

3. # Turn off mod_security filtering.
SecFilterEngine Off

# Turn off filter.
SecFilterScanPOST Off

4. Options -Indexes

While there is a common consensus on lines at 2,

could somebody pl let me know what do lines at 1 & 3 do and whether
they are necessary.

as for 4, if someone were to key
( like say, w.r.t my site )

http://www.bestnewcellphones.deals-f...ontent/plugins

it will return a 404 error .

as per my frugal IT knowledge what it does is 'deindexing'

But would it also disable the search engines from indexing my site?

Thanks

Vijay