Blazor WebAssembly runs C# in the browser. Your components, your models and your validation are the same types you would write on the server, compiled to WebAssembly and shipped to the client.

That is genuinely useful and it is not free. The download is larger than a JavaScript bundle, the first render is slower, and anything the browser API does natively still needs an interop call. The articles below say so where it matters rather than pretending otherwise.

The order follows how an application grows: components and binding first, then routing and forms, then talking to an API, then securing it, then getting it deployed. Authentication takes up a lot of room here because Blazor WebAssembly runs on the client, so nothing it holds can be trusted and every call has to carry proof.

Components, Binding and Lifecycle

The building block and the hooks around it. Read the lifecycle article early; a surprising number of Blazor bugs are a method running at the wrong moment.

Routing, Navigation and Query Strings

Moving between pages and carrying state while you do it.

Forms and Validation

Blazor reuses the same validation attributes as the server, which is one of the strongest arguments for the whole model.

Calling an API With HttpClient

Fetching data from a Web API, including the error handling that is easy to leave until it is too late.

Authentication and Authorization

The biggest section, and deliberately so. A WebAssembly client holds no secrets, so everything here is about proving identity to a server that does.

Tables, Paging, Searching and Sorting

Showing a list of things and letting a user work through it.

Files, Clipboard and Browser APIs

The places where the browser still has to do the work.

JavaScript Interop

Calling out to JavaScript and back again, which you will need sooner than you expect.

Performance and Deployment

Making the download smaller and getting the thing hosted.

Testing and Error Handling

Proving a component behaves, and catching it when it does not.

Where to Go Next

Blazor WebAssembly needs a server on the other end:

Decide early whether the application is hosted or standalone. Almost every authentication article below branches on that one choice, and changing it later means redoing the login.