The tutorials are cumulative. Each one assumes the one before it, and each one is a complete running app.
Hello world is one file with one page. You write it from scratch and learn the four parts of every Stario app: a route, a view, a handler, and a bootstrap.
Realtime tiles is a shared board. Every open tab sees every click. You learn the live-page pattern: one open response that pushes HTML, and short commands that change state.
Chat room is the same pattern as a project: a feature folder, SQLite, identity, and tests.
All three live in the Stario repository under examples/. You can clone them, but the tutorials also work if you type along.