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With the advent of the WordPress Site Editor (aka Full-Site Editing) and block themes, the way WordPress users have to think about how to modify their websites and themes has changed dramatically.
These days, instead of style.css and functions.php, there is a new central file for block themes: theme.json. Plus, instead of CSS and PHP, you need to be familiar with a new type of markup to make changes to it. Its name is JSON.
While that might sound scary, the good news is that JSON is actually quite approachable. With a bit of technical understanding and tenacity, it’s not that hard to understand and to start making theme changes by yourself.