'struggling to get to a root folder to open a html file

Trying to get to my root folder "warwicksub" to get to open the file "warwick.html", but still it won't get to it. enter image description here

I have tried <a class="nav-link" href="warwicksub/warwick.html" enter image description here

or <a class="nav-link" href="../warwicksub/warwick.html" enter image description here

but it still doesn't get to my warwick.html file

html root subdirectory

Sources

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