moshu

Man, when I say something like “you have a code after the closing

</body>
</html>

— that means that I have looked at it.
Checked even the feed validator:
https://validator.w3.org/feed/check.cgi?url=http%3A%2F%2Fblog.robotforest.com%2Ffeed
Did you click on the “help” link(s)???

This is what you have in your source code:

</body>
</html>
<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "https://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>
<script type="text/javascript">
var pageTracker = _gat._getTracker("UA-5060344-3");
pageTracker._trackPageview();
</script>

So, who put it there if not you?
And as I said: there must be NOTHING after the closing html tag!

Start by giving a link.
Because the single posts’ permalink that you were talking about… have nothing to do with the next/prev navigation on your category archives.

Clear the floating after every image+text.
E.g. add something like <br class="clearer" />
and in the stylesheet define it:

.clearer {
clear: both:
}

Yes, all this thread has nothing to do with WordPress. It is about your struggle to set up your own server, not WP – so it should not even be here!

You don’t. You can set your permalinks (in Settings) to use URLs like
example.com/page-title

I don’t know about the body class.
But the two level menu highlighting has been figured out quite a while:
https://www.transycan.net/devdemo/about/
(follow the links from there)

Don’t hold your breath because this is NOT a WP question!
Go to a specialized forum where they teach you about image editing and mapping.

It is one single image:
https://www.blueframe.ca/blog/wp-content/themes/fspring_widgets_jillij/images/bf.gif
Make you own image with the same name and overwrite it.

That’s not WP – that site (the Docs) is running on mediawiki.

Don’t put ever anything in your footer.php file OUTSIDE of
/body
/html
Everything MUST be inside of those tags.

And it has nothing to do with subdomains – as always it is a user mistake!

No, there are no “headerless” themes. Why should there be any? People use WP as it was designed: a stand alone blogging tool… and more and more as a CMS.

A PHP file is just that: filename.php (and not filename.html).
E.g. about.html = a HTML file; about.php = a PHP file
BTW, the whole WordPress has been written in PHP, as you probably noticed.

Yes, standard Loop in the index, nothing else, without your modifications. Also, no div (layout) modifications.

Does it work if you switch to another theme like the default?

The error is about a table for a plugin, not a WP table.

Well, despite what you think… in 99.99% of the cases it is a user error: a space, a missing quote [‘], wrong quote (when using bad editors) and so on.

It is easy to check (since it’s not likely he will come back after 4 months):
deactivate all your plugins and see if it works
if yes, activate them one by one, and see which one stops it