Experience.
Good judgement comes from experience.
Experience comes from bad judgement.
Not always. It can come from research and thought. You don't need to have the bad experience, you just need to think what bad experiences can happen and then apply a measure. A risk matrix. Proper planning prevents poor performance.
@skinny started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Good judgement comes from experience.
Experience comes from bad judgement.