Div Id Main

So a div s class will help us know what it looks like its fonts colors etc.
Div id main. Well organized and easy to understand web building tutorials with lots of examples of how to use html css javascript sql php python bootstrap java and xml. The challenge wants you to add the id of main to the div in the html. Main id main main main is a part of the semantic tag set brought to us by html5. Adding an id attribute to the main element lets it be a target of a skip navigation link.
Skip navigation also known as skipnav is a technique that allows an assistive technology user to quickly bypass large sections of repeated content main navigation info banners etc. Personally i would prefer folks start using the semantic tags a lot more. I hope that was a decent non technical answer. It is a still a block level element it still presents and functions exactly like a div but it actually has a meaningful name.