The URL resource type allows you to display a link to a webpage on your Moodle module. Ensure that you are linking to a page that is not restricted and is open to students. For example:
You should also ensure that the content on the webpage is accessible to students (e.g. works with screenreaders and captions are available on video content.) Accessibility guidance is available.
When linking to external content, remember to check your links at the start of each term to confirm that the link is still working.
Links added via drag and drop require students to select twice to open the link, so you need to change the Display of the link.