I was just gonna mention Steve Keen. I was an econ student and he redpilled me (although I already had doubts). I haven't studied his post-Keynesian contributions in any detail, I know he is critical of Marxian economics. But for someone new to economics I would recommend an intermediate econ textbook like Varian, then read Steve Keen's debunking economics and I think they'll have a solid understanding of what neoclassical economics is and what's wrong with it. If they're more mathematically inclined they could try cracking open a grad level econ textbook (again Varian, or Mas-Collel) for a deeper understanding of what Keen is critiquing.
BASIC ECONOMICS
Jonathan Wood
Landon Perry
Go with Hal Varian, not neoliberal shill Mankiw and conservative libertarian shill Sowell. Varian may also be capitalist but at least is pretty neutral and professional about it.
Nolan Powell
Ha-Joon Chang's Economics: A User's Guide is excellent because he lays out """basic economics""" whilst also being quite critical of neolib dogma.