I would recommend checking out Slicehost's articles and ebook on DNS topics: http://articles.slicehost.com/tags/dns
They 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)
For example, most of my domains are registered through Hostway or GoDaddy, but I do most DNS management through Slicehost or Rackspace.
I would recommend checking out Slicehost's articles and ebook on DNS topics: http://articles.slicehost.com/tags/dns
They 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)