How to generate html pages with mysql?

Question

PHP

I'm still new in this area, so do not scold too much.
For example, you have a ready-made template, and a database, how to make it so that when new data is entered into the database, the template is taken and the final html is created, for example:
Habr is written in the title - after that html is created with the name habr.html.
This question is of course very simple, but I don’t understand, if you can, please send links to guides where this is explained in an understandable way.