Depth

When it comes to learning something new, depth beats breadth.

In both fields, players tend to get attached to fancy techniques and fail to recognize that subtle internalization and refinement is much more important than the quantity of what is learned .... It is rarely a mysterious technique that drives us to the top, but rather a profound mastery

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Doing great work is a depth-first search whose root node is the desire to. So "If at first you don't succeed, try, try again" isn't quite right. It should be: If at first you don't succeed, either try again, or backtrack and then try again.