Persistent data is stored in the persistent object. Unlike regular save files, this data is shared across all playthroughs. Common uses include: : Keeping track of seen CGs.
If you have a specific “extra quality” editor in mind (e.g., a particular GitHub fork), I can give a more tailored review—just share the name or link. renpy persistent editor extra quality
: The official Persistent Data documentation covers how to define and save variables that survive game restarts. Persistent data is stored in the persistent object
This example provides a very basic introduction. Ren'Py has much more to offer, including complex statements for advanced interactions, screens for creating menus and other UI elements, and more. The Ren'Py Documentation is an invaluable resource for learning more about creating visual novels with Ren'Py. a particular GitHub fork)