> Don't buy domain names I'm not sure I understand this one - anyone have an explanation?

When you buy a domain name, you are supposed to supply accurate ownership information. If you do not, the registry can yank your domain when they discover that. Most registrars obfuscate/hide the information in their whois service, but they still need to have it to comply with the rules of the registry. That information can be subpoenaed.

The purchase/renewal transaction(s) also leave a trail that can be followed.