Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

package

A Cargo project: a Cargo.toml plus its source files.

A package is a directory with a Cargo.toml manifest that Cargo builds into one or more crates.

Examples

cargo new hello creates a package: Cargo.toml, src/main.rs, a .git folder and a .gitignore.