[yogsototh]

I am sorry if I didn't made it clearer. Of course, you don't need to know Haskell to follow this tutorial in particular.

But it is clear in my mind, you must know Haskell to do something useful with it. And in particular, make a web application, even if using a web framework.

As you stated, Haskell is not a language you could learn in 3 hours like I learned the bases of Python. It takes a very long time to learn, particularly when you're not used to functional programming.

But an intent of this tutorial was to promote Haskell. Clearly, if someone want to do something a bit more useful, he will very soon realize he must understand Haskell.

I added a specific advice in my conclusion similar to yours and pointing some essential resources.