How to remove html errors in joomla?

Question

PHP

I checked the site tcn.by for errors on the service https://validator.w3.org
I would like to ideally fix everything. But starting with the first one, I can’t understand in which file to look for these lines and fields?
Accordingly, I didn’t take on the rest, tell me, please, who can help in the case.

Answer 1

The first item, I suspect that in the file.
/templates/hot_ecommerce/index.php

Answer 2

And what for you styles in a body html zababahali?
And look in the code, for example, the very first problem, which is understandable, a piece of code begins with <<style type="text/css">*:focus{outline:none}
This is a piece of style from Virchumart. Essno is not used anywhere, you can make sure in the inspector.
I hope you have template files somewhere on localhost? Open the file manager, and search for where this piece of code is located.