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Hello!
Welcome to the fCC forum
You need to declare your document by adding a DOCTYPE. And add an html element set with a lang attribute set to en. And then in your head element add a head element and a body element.
Like in the image below, but only the DOCTYPE declaration, the html element, the head element and the body element.
If you do not understand, I suggest that you should start right at the beginning of the Responsive web design course: