Not a WordPress user but this is cool, especially this - "Build an entire site, save it, host it"

WordPress Playground makes WordPress instantly accessible for users, learners, extenders, and contributors. You can:

• Try a block, a theme, or a plugin
• Build an entire site, save it, host it
• Test your plugin with many specific WordPress and PHP versions
• Embed a real, interactive WordPress site in your tutorial or course
• Showcase a plugin or theme on your website
• Preview pull requests from your repository
• …or even run WordPress locally using the VisualStudio Code plugin or a CLI tool called wp-now