what's a good resource or book to learn domain management
callmeed: Out of curiosity, who is your registrar?I would recommend checking out Slicehost's articles and ebook on DNS topics:
http://articles.slicehost.com/tags/dnsThey have helped me quite a bit. From my experience, I would say the following are the most useful concepts to grasp:* Knowing the difference between an A record and a CNAME record* Understanding MX records (especially with the prevalence of Google Apps for email)* Understanding SPF records (helps if you have a web app or form that sends mail)