How to use RewriteCond and RewriteRule in .htaccess

You can use .htaccess file that located on the root of your web site to make versions or make one version of your web pages , “which is very important for google ranking and SEO”.

by editing the file using notepad or any plain editor :

First you have to enable the Rewrite Engine  on the .htaccess file as bellow:

RewriteEngine on 
To redirect from yourdomain.com to www.yourdomain.com
RewriteCond %{HTTP_HOST} !^www\.(.*)$ [NC]
RewriteRule ^(.*)$ https://www.%{HTTP_HOST}/$1 [R=301,L]
To force your website for using HTTPS using WWW incase you have install SSL
RewriteCond %{HTTPS} !=on
RewriteRule ^(.*)$ https://www.yourdomainname.com/$1 [L,R=301]  
Redirecting www to non-www
RewriteCond %{HTTP_HOST} !^yourdomain\.com$ [NC]
RewriteRule ^(.*)$ http://yourdomain.com/$1 [R=301,L]
Redirect www urls to non-www with https
RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
RewriteRule ^(.*)$ https://%1/$1 [R=301,L]