It’s helpful if you can learn to describe the issues you’re facing in your own words, including any error messages you might be seeing. Not only is this a vital skill in coding but also, the more you say, the more we can help!
Below the DOCTYPE , add an html element with a lang attribute set to en , so that you have a place to start putting some code.
You don’t appear to have added an html element. For some reason though, you have a closing head tag, which shouldn’t be there.