.htaccess url rewriting

Rewriting domain.com/index.php?page=home to domain.com/home

Add the following code to the .htaccess file.:

RewriteEngine On
RewriteRule ^([a-zA-Z0-9_-]+)$ index.php?page=$1
RewriteRule ^([a-zA-Z0-9_-]+)/$ index.php?page=$1


Rewriting index.php?id=12 to index/aboutus/12.html

RewriteEngine on
RewriteRule ^index/([a-zA-Z0-9_-]+)/([0-9]+)\.html$ index.php?id=$2