Should you buy various versions of your domain name, and if so which ones?
If you have your site redesigned or change your web hosting you will want your domain to point to the new site. This should be straightforward if you registered the domain yourself and look after your account. If someone else registered the domain for you, you might come across problems. This article explains what you need to know, gives a bit of background about domain names & the DNS, and how to go about solving any problems you come across.