Board games and game theory.
In life there are rules, formal, unwritten, or natural. If you learn to work them, you succeed. If not, you bang into them and receive the equal-and-opposite reaction.
This has helped me think strategically in all manner of things, especially interpersonal interactions, but also in product management and (in my own trivial examples) coding - cost benefit analyses, heuristics for problem solving, even bug hunting.
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