how to remove .php .html from link

if you are wanting to remove php or html from a url using htaccess then insert this code

##remove php from url
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^\.]+)$ $1.php [NC,L]

##remove html from url
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^\.]+)$ $1.html [NC,L]

After entering this on your htaccess you can then serve pages without the extension.

For example with href tyou can simply use no file extension like below
<a href="http://example.com/wallpaper" title="wallpaper">wallpaper</a>

if you are hosting with godaddy and a few other hosts you made need to use multiviews

Options +MultiViews
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^\.]+)$ $1.php [NC,L]