We cannot all be experts, but what is necessary to know ?
In Economy there are a few very contradictory opinions. Forcing a correct answer would be equivalent to baning comunits or anti-comunist or some other group that has the incorrect opinion (where the correct opinion is probaly your opinion).
No much
In fact, I would say the list of "today" is pretty similar to the list of a decade ago, a quarter century ago, half a century ago, and a century ago
Most people do not need to know much if anything about most things
Basic financial literacy
Where food comes from
How to make a handful of meals more-or-less 'from scratch' (or...at least without too many pre-kitted items)
The roles of the branches and levels of government in your country
How to spot statistically-likely (and -unlikely) data both online and in print
And the basics of keeping your devices up-to-date
Anything else you can look up if/when you have the interest