What is a PRO CODER's most IMPORTANT TOOL?

As a pro coder, we use LOTS of tools. But which one is absolutely critical? Which one is vital to a strong and successful career? Which one should you invest time and energy in to make sure it's working?

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Do YOU uphold the Pro Coder motto, BE PROFESSIONAL? https://store.procoder.io

DISCLOSURE: All opinions stated here are mine and do not necessarily reflect those of any team or employer. Any usage of "Spring", "Spring Boot", "Spring Framework", "VMware", "Pivotal", or anything else is completely unaffiliated with its owners. From time to time, I may post affiliate links for products I enjoy using. They don't cost you anything extra, and I may get a small commission.

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