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Review of VimGolf powered by the Slant community.
It is a site where there are vim quizzes to solve. From a given input file, you need to reach the given output file with the fewest keystrokes as possible. There is a ranking of the users, and you can see the solutions given by the others. I would indicate this site if you already know the basics, and want to go pro.
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Pros
Pro Live training
Pro Good to learn efficient ways to make things done
After trying to solve yourself a challenge, you can see the answers from better users. Best answers usually brings really useful insights!
Cons
Con Not for absolute beginners
You can see the solutions given by other users, but rarely they have some kind of comment. It expects you know the basics.