1. To change the theme’s CSS, simply install the “simple CSS plugin” and add the code.
2. To add functionality to your theme’s functions.php, simply install the “Code Snippets plugin” and add the code.
In this case, you need to install 2 plugins.
Or you can install the child theme and edit the code directly in style.css and functions.php.
In terms of site speed and safety, which method do you recommend, plugin or child theme?