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I'm also just getting into Rust and I've loved the module system so far. I'm coming mostly from Java, Kotlin, Python, and TypeScript, which are all rather weak when it comes to modules. In comparison, I like that Rust treats modules as an organizational unit rather than just a side effect of file/folder structure, and I think they manage to do it in a way that isn't overly hard to navigate.

IMO the module system is explained very well in the book. Read it carefully once or twice, experiment a little, and you're golden.

The best mental model is that `mod` works exactly like `fn`, `struct`, and `enum` — creates a new named item in its location.

A mod.rs is exactly like a __init__.py.

Except Rust removed a couple of annoying edge cases that are present in Python.

what is stranger still is the compiler-generated symbols that mimic C++.

or that exception is weirdly handled.

Jury is still out on Rust being incorporated into the Linux kernel because of the above mentions.