How do I figure out what my app is actually doing?

I've been vibe coding for a few months as a non-coder and I'm still annoyed with the fact that I can't understand what's happening under the hood.

I've got a decent understanding of code but I can't actually write it and I don't know the best practices for stuff like architecture and security which apparently aren't baked into most vibe coding tools. So my question is...

Why not??

Is vibe coding just a fun pass time for non-coders to make them feel like they've built something? I can't imagine many non-coders have actually deployed many vibe coding tools in a business setting or for anything outside of personal use.

For anyone who has, I'd love to see what you've managed to build!!