Working Class: the vast majority of humanity. Everyone whose basic necessities for survival and physical as well as mental health is controlled by others. Despite the name, this class DOES include those who are unable to work.
Lesser Owning Class: Anyone who controls said necessities but at least employs or otherwise benefits people of the working class. These aren't necessarily bastards but there should be as few of them as possible.
Parasite Class: The ones whose main or sole source of income is gaining wealth by having wealth already. Examples include landlords, billionaires borrowing against their stock portfolio and others whose enrichment removes money from the general economy while adding only to their own dragon hoard and/or mostly closed systems like stock markets. That these exist at all is one of the greatest atrocities allowed by mankind.
Anyone who controls said necessities but at least employs or otherwise benefits people of the working class.
There are overlaps, but I'm tired of explaining nuances in this thread. I didn't even write the owning class is good leaders. I instead mean that I wish what OP labeled as the owning class gets replaced with good leaders.
The rewards tend not to be for hard work, but for clever exploitation and excess cruelty.
If you can successfully commit/facilitate a bunch of crimes (particularly, but not exclusively, white collar crimes) then you can break into the petite bourgeoisie. Florida's Rick Scott, a guy who made a fortune scamming Medicare is a great example. The WWE's Vince McMahon, a guy who encouraged his rooster of steroid abusing thugs by offering them the opportunity to rape his female staff members, is another.
If you can stomach the grisly work of denying dying children their insurance claims or evicting elderly residents illegally foreclosed on during the 2008 housing crash or overseeing the butchery in Iraq/Afghanistan during the Bush Era or the torture prison in Guantanamo Bay (another Florida favorite, Ron DeSantis, broke out as a conservative darling after his tenure writing legal briefs that justified waterboarding and sexual abuse of terrorism suspects), then you can get a leg up.
Plenty of these professions are functionally quite easy and the quality of the work is incidental to the reliability with which you adhere to the company/party line. The real pay out is in cultivating friends higher up the ladder and proving yourself a loyal little footsoldier, not in proving you can march the farthest or carry the heaviest loads.
If anything, jobs that consist of shitty drudge-work tend to be the worst paying and are the least reliable for promotion. The pimp makes far more than the prostitute and has to do none of the dirty work.
The parasite class includes the welfare class and the corporate welfare class. Not all of the poor people are working class and not all of the parasites are ultra rich.