Then you are more than welcome to educate us all on what it is.
You have to separate the bat-shit, radicalized faction (that showed up in DC yesterday) from the 10's of millions of other people that support Trump but wouldn't ever end up in a situation like yesterday.
Think of it this way - you're a poor working class person who can't get ahead. If you live in an urban center, you're probably a democrat and might buy into AOC or Bernie explanations for your problems. If you're a poor rural working class citizen, you feel totally disconnected from the "elite" DC decision makers who think they know what's best for you.
Both people have the same underlying problems, but because of various culture driven differences, they've bought into completely different explanations for their problems and thus different solutions.
Trump didn't figure out economic populism until December 2020 when he pushed for $2,000 stimulus checks. If Trump calls that "socialism" then his base thinks it's terrible. As soon as he supports it, they're on board. Can you imagine if he had learned that 3 years ago? How much bi-partisan pro-worker/little-guy legislation he could have championed?
Imagine you're the evil corporate overlord who wants to suppress the working class. You have to keep them divided. Cultural wedge issues is how you do that. Think what you want of Trump supporters - many of them brainwashed by right-wing propoganda - but they genuinely believe Trump is fighting on their behalf against a failed DC ecosystem that works for the powerful.
Seeing Hawley stand with Sanders in support of $2k checks tells you something. The energy on the right is directed very poorly right now. But it's driven by the same core problems (wealth concentration / inequality) that is driving the energy on the left. If Biden is smart, he will focus on the economic side of this and tread cautiously on the cultural wedge issues.
What unites the populist right and left? Siding with people over corporations and lobbyists.