Which directory of my PHP webapp should I publish on git?

I am working on a PHP webapp. I have to publish it on a distributed version control system (git) but I am not sure wether if to publish the root directory of the project or the public_html folder.

The root folder contains composer-related files and configuration files.

Also, what are the best practices to include the config files, which have to be omitted/obscured from the version control?

The project is structured as follows:

+ root
|_ (...)
|_ config.php
|_ composer.json
|_ composer.lock
|_ public_html
    |_ index.php
    |_ (...) // The rest of the project

source https://stackoverflow.com/questions/77452746/which-directory-of-my-php-webapp-should-i-publish-on-git