The XHTML and other versions of HTML format requires the / however new formats like HTML5 doesn’t require, Codecademy’s course was created some time back and the Checker works with the older version
The Make a Website course which I recommend you do after HTML & CSS uses HTML5 format
okay i’ll start on that right away, as i just finished the HTML & CSS Course. btw is it legit to upgrade to pro to get the extra study material or is it better to come up with projects of myself?