The important part of a save button is what happens after the click. A small repair-status tool becomes a way to understand how the web works. Follow fictional workshop characters as they read a record, review a change, check it at a server and explain an outcome without pretending every request succeeds. Twenty-four chapters introduce files, terminal commands, Git, HTML, CSS, JavaScript, forms, HTTP, APIs, versions, debugging and meaningful tests. Fourteen visuals, worked examples, a glossary and three transfer studios connect the code to decisions a person needs to make. This is a patient introduction for adult beginners, with technical source notes and fictional practice records. Its local learning example is not a hosted service or a production business. The book distinguishes a working demonstration from the later work of persistent storage, accounts, deployment and operations. Inside this edition: 24 chapters and three practice studios; Browser, server, data, debugging and testing explained through one small tool. A question to try: A screen says a change was saved, but the network failed. What evidence would let the app tell the person what actually happened? Adult beginners and nontechnical makers learning the parts of a small web application. Digital edition: one 139-page reading PDF in English. Read it on a suitable screen; use selected pages for paper-based activities where appropriate. The book describes a local learning example; this listing does not include a hosted application. Includes AI-generated manuscript text and illustrations.