1. Muscle memory has nothing to do with "mastering" Vim. 2. The chapters only cover basic features so the "mastering" claim is extremely overblown. 3. The mea

1. Muscle memory has nothing to do with "mastering" Vim. 2. The chapters only cover basic features so the "mastering" claim is extremely overblown. 3. The meanings of j and k are inverted right from the sample exercise. This doesn't inspire much confidence. If you _really_ want to learn Vim, forget all about that $25 nonsense and do it properly with :help user-manual.