Is there a way to link to the latest single blog post?

This should link to the latest post!

If you can get to this place, it's very straight-forward! Lemme know if you need help getting here though :)

You can do it using Velo. This requires a few lines of code.

Query Posts data collection to get the latest post and set link to a button.

Here's a short example where "#latestPostButton1" is your button id:

import wixData from 'wix-data';

$w.onReady(function () {
        wixData.query("Blog/Posts")
        .limit(1)
        .find()
        .then(results => {
            $w("#latestPostButton1").link = results.items[0].postPageUrl;
        })
});

I hope this helps