Well, when you start with a "tutorial" (or whatever you call this thing) like this one, you get a false idea of just how complex web development actually is.

I once wrote an e-book on how to use the now mostly defunct Kitura web framework. It started with teaching you how to make a one-file script to output a "hello world" message. After that it talked about using templates and database connectivity and all that, very iteratively. Client-side scripting or "serverless functions" (whatever those are) were not a part of it at all.