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3.0

Should be a titled: "The First 20 Hours: How the Author Learned (The Basics of) a Few Things... Fast"

Gets 3 stars for introducing me to the idea that you can achieve a decent level of performance in something in the first 20 hours of dedicated practice.

Unfortunately it's otherwise a 2 star book, mostly padded with rambling accounts of the author's adventures in learning different things. Some of these were more interesting than others, but there wasn't much here that helps the reader figure out how to apply these concepts to their own learning goals.