This is more like: how to survive rustc as a cpp programmer which is honestly your mindframe when you start out, and it sets you up for "okay now that you speak the syntax, this is how to really think in rust terms".
Clippy likes idiomatic Rust and will suggest you change code that's not idiomatic into code which is, even when the machine code would be completely identical - the rationale being that the maintainer (later you with more Rust knowledge, a colleague, or even some stranger) is more likely to follow the idiomatic Rust and the whole point of source code is that it's for humans not machines.
Clippy is no substitute for a capable human reviewer, it has no sense of taste or style, no higher level understanding of the problem, but it's free and it's right there and unlike a human reviewer you won't feel judged which can be sensitive when you're learning a new language and are used to having mastery.
