Early in the internet you had to always use the www in from of the domain name to access the web site. Today most browsers allow you to type only the domain name, like nctechtips.com.
No http:// or www is required. You still need to type the .com or .net.
However, there is a shortcut that will work. If you just type the domain name (such as nctechtips) in the URL address and hold the Ctrl (Command, on the Mac) key and press Enter, you do not need to explicitly type the .com at the end.
Listen to the radio audio.