Ask HN: What concepts and facts should be common knowledge among voters?

The economy does better under Democratic administrations than Republican, going all the way back to the 1920's

Media literacy.

Voters need to learn how to guess at the bias of a source (not just news, but also science).

They also need to know how that bias can be reduced and whether the author(s) attempted to do it.

And they definitely need to know that a single source is almost never enough evidence to draw a strong conclusion.

The two "c" words