I’ll assume by “first” you mean “newest”, since if it’s the oldest, then all you’d need would be the url of that post.
$latest = get_posts(array('numberposts' => 1));
$url = get_permalink($latest[0]->ID);
echo "<a href="" . $url . "">Go to first post</a>";
This should give you a link that always goes to whatever is the latest post on your site. Where you add the code is dependant on your theme, as well as your personal preferences.
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