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 onTo 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]
