1.Link a file called style.css to index.html. The attributes should be set in the following order: href, type, rel.
You didn't exactly link a file called style.css. I only see a link to the fonts.google.com css.
I just, did but it says that I didn't do it correctly.
You should probably keep the link to the Google font css, but anyway, if you put quotes around style.css it should work.Example: <link href='style.css' ...> (Put the rest of your code in the dots.)
<link href='style.css' ...>
Hope this helps!