To insert URLs (or links) into your Moodle course,

The page that opens contains a number of settings. For the purposes of these instructions, the common settings will be covered.

Automatic - The best display option for the URL is selected automatically
Embed - The URL is displayed within the page below the navigation bar together with the URL description and any blocks
Open - Only the URL is displayed in the browser window
In pop-up - The URL is displayed in a new browser window without menus or an address bar