Great website to learn about Vim. I can also warmly recommend the book Drew wrote: Practical Vim. If you have bought the hard copy via some other way than the website of the publisher, you still can get a nice discount on the ebook. Check out the last page inside the book for details.
And after taking the “Vim master class” I still don’t feel like a master, but I feel empowered and know better where to turn for answers and how to perform repetitive and why solution abc is better than xyz. Great stuff and therefore I warmly recommend the course as well.