Modules
Modules, put simply, are the building blocks that add the text to your fastfetch output. Each variable corresponds to a piece of system information. They are also called "modules" in normal fastfetch terms.
A variable can be either:
A String — simple name like "kernel"
An Object — enriched form with custom keys, e.g. {"type":"disk","folders":"/"}
When you set a property on a string variable, it automatically converts to an object. The reset command reverts an object back to its default string form.