It would help if instead of saying "set theory" we emphasize the algebra of sets. Not by that name, but this level of teaching sets was common in middle school

It would help if instead of saying "set theory" we emphasize the algebra of sets. Not by that name, but this level of teaching sets was common in middle school math late last century, not sure about this century, in the US. And this would be enough for most people trying to read technical documents using set notation. https://en.wikipedia.org/wiki/Algebra_of_sets https://en.wikipedia.org/wiki/Algebra_of_sets