I've heard that projects prepared in Publisher can be exported to HTML, is it true? And what about the site generated in this way, is it correct?
Of course it's possible but the question is what for? There are so many free and good programs for HTML
If you want to save as html, go to export options and click public html file. But I don't know anything about the compatibility with standards
But if he wants to make a website at school, he can do it in Publisher as well.