There's a lot -- I mean, a lot -- that the built-in Vim tutorial doesn't even try to cover. It was enough to make me feel like I was "good enough" with Vim, even though I rarely used it for editing anything more substantial than git commit messages and config files, and if that's what you want out of Vim it's fine! But I bought the ebook version last month of Practical Vim when the publisher was running a "Christmas in July" sale, and it is kind of mind-blowing. (How did I not know about the ":find" command, and why do I need the ctrlp.vim plugin now that I do?)

As to the question about the $100 tutorial, though, that's... well, a lot, but I suppose it depends on whether "Vim Valley" takes an approach that "clicks" for you in ways other things don't. Practical Vim is $23 for a DRM-free ebook, and it has a lot of hands-on exercises; I learn pretty well that way, I've found.

Specifically, I was neither encouraged nor shall I receive any compensation for putting that link here.

If you choose to disbelieve me, that is your choice.