To avoid duplicate content (not relevant), you must chose using www or without www. Another consideration not using www:
- www is sub domain
- www makes URL longer
Before decide, you must check your www pagerank anda without www pagerank.
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I prefer to use without www because makes shoter url.
You can redirect all hit on subdomain www to domain on .htaccess. Just add this:
RewriteEngine On
RewriteCond %{HTTP_HOST} !^your-domain-name-of-course\.com$
RewriteRule ^(.*)$ http://your-domain-name-of-course.com%{REQUEST_URI} [R=301,L]
If you prefer to use www instead without www, you can add this script on .htaccess:
RewriteEngine On
rewriteCond %{HTTP_HOST} ^your-domain-name-of-course.com [NC]
rewriteRule ^(.*)$ http://www.your-domain-name-of-course.com/$1 [R=301,L]