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7章の最初のページ見ればそれぞれどういう関係なのか一目瞭然
単数形複数形の違いを丁寧に訳してなければ重要な意味が日本語訳では消えてるかもね

・Packages: A Cargo feature that lets you build, test, and share crates
・Crates: A tree of modules that produces a library or executable
・Modules and use: Let you control the organization, scope, and privacy of paths
・Paths: A way of naming an item, such as a struct, function, or module