Cargo

The manifest/lockfile split, how Cargo unifies feature flags across a whole dependency graph, and how workspaces turn multiple crates into one coordinated build unit.

`new`, `build`, `run`, `test`, and the project layout.

Dependencies, metadata, and versions.

Conditional compilation via features.

Dev vs. release, opt-levels, and LTO.

Multi-crate builds and shared lockfiles.

Versioning, `cargo update`, and `cargo audit`.

`expand`, `tree`, `bloat`, `nextest`, `watch`.

Metadata, versioning, and `cargo publish`.

Reproducible, fast, well-organized builds.