Old Married Couples Agree, This Makes a Marriage
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Some of the more obvious answers...
But a surprising answer to some: Get good at fighting!
Makes sense to me. It was said to me once to not find someone with whom you agree on the most number of things, but find someone who you can disagree with well. Anyone can get the "easy stuff" right, but it's the couples who do the hard stuff (i.e. fight) well that make it.