Here are some more tips to keep in mind?

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It is also recommended to work in a local WordPress development environment or staging site . This creates a replica of your current website where you can safely test changes without affecting your visitors.


Start with minor changes in your theme.json file and test them thoroughly before making more complex changes.
If you are unsure about any specific properties or settings within the theme.json file, please consult the official WordPress documentation .
Feel free to ask for help from the theme developer’s support team or the WordPress.org support forums if you run into any issues. For more information, check out our guide on how to get WordPress support .
How to Edit WordPress Theme.json File
Based on our research and testing, we have discovered two ways to edit WordPress theme.json file: using the site editor or using code. The first option is much easier and safer and allows you to see the changes from the frontend of the website.

Meanwhile, the second choice is recommended if you are comfortable with advanced WordPress development.

Edit theme.json without code (beginners)

To edit the theme.json file without touching the code directly, you can use the Create Block Theme benin telemarketing data plugin . This plugin was published by the official WordPress.org team to allow users to create a custom block theme, edit it, and/or save style variations of their block theme.

First, install the WordPress plugin in your admin area. Then, open the full site editor by going to Appearance ” Editor .

Selecting the Full-Site Editor from the WordPress admin panel
At this point you will see several menus to change the theme.

Here, select “Styles”.

Choosing Styles in the Full Site Editor
Then, click on the “Edit Styles” pencil icon.

This takes you to the block editor to edit global settings and site styles.