I'd just create a Blazor project with individual authentication (and don't worry about interactivity). Then inside Components/Pages you'll find code that should look pretty boring. You'll see some HTML, you'll see things like `@page "/counter"` and `@currentCount` and it isn't that hard to understand that the at-symbol means "code thingy" and "oh, @page must be how I specify the URL", and at the bottom there will be an `@code` block. If you look at the authentication pages, you'll see how they handle forms and save things to the database.

There's always more than a comment can talk about, but that's the gist. One good thing is that Visual Studio should be able to help you with a lot of stuff. It's pretty good at keeping you on a good path in the code and pointing out how to fix things.