The Question and Answer section for Outliers is a great resource to ask questions, find answers, and discuss the novel.
From the text:
All the outliers we've looked at so far were the beneficiaries of some kind of unusual opportunity. Lucky breaks don't seem like the exception with software billionaires and rock bands and star athletes. They seem like the rule.
He surmises that ten thousand hours of practise is needed to master skill and be called an expert.