> "If you can read and understand documentation, understand fundamental concepts like OO or functional paradigm, and understand what a stack is, a closure, recursion, the difference between an integer and a float, or a character and a string, methods/functions, etcetera, you are more or less hireable."

I'm sure this is true for many positions, but I'd resist the temptation to cast this across the broader job market. All of my recent interviews went significantly deeper than what you listed (though I'm not sure "functional paradigm" is a fundamental concept), so in my experience the minimum to be hireable, at least in their opinion, was higher than what you indicated.