what @shimphillip was saying was:
1- you have a badly spelled word “Botttom”. Please fix it to the correct spelling.
and
2- you need to give your “<footer” tag a new “id” attribute which is equal to “footer”.
To give you an example of this. Let’s pretend I asked you to give the main tag an id attribute of ‘main’. then you would modify this line:
<main>
to
<main id="main">
This is just an example. All you have to do is understand this example and do something similar for the footer tag.