I started learning vim from https://vim-adventures.com/ and it has been invaluable.
Regarding vim-adventures, I just gave it a try for the first time and while it does seem quite fun it puts a massive amount of emphasis on h and l to move left and right (that's all you start with, and even though you unlock w, e and b soon enough you can't use them outside of text tiles).
I hardly ever use h and l. There's almost always a better and faster way to move around, be it w, e, b (and their uppercase variants) or f/t/F/T. I think the only time I ever use h and l is when I need to move inside a word (fairly rare), or when I want to do something like "remove the next 4 letters and insert something instead" in which case I'd do something like c4l. Also commands that operate on words or look for specific anchor characters compose much better for . or macros.
I've read it only recently, after I was already familiar with Vim, and I cannot recommend it enough!
I had lots of "oh, I had no idea this was possible" moments and it took my Vim knowledge to the next level where I'm now (even) more productive than before.
Having said that, I'm not sure it is a good introductory resource for somebody making their first steps in Vim.