I have Velite set up for my blog from following this example

https://github.com/zce/velite/blob/main/examples/nextjs/velite.config.ts

But I have some questions about what some of this is actually doing.

- what is the point of defining the tags, categories, options and meta?
- what is the metadata type? I don't see that in Zod docs
- what is the prepare portion of the config doing?

Just trying to understand what this all is so I can better use it. Thanks!