The Price of Oil Goes Negative

Oil went negative because the cost of carry had been going down, so you could buy oil, put it in storage and make money selling t in the future. It costs a guy less to pay somebody to take his oil away than to shut that well off and risk its next five years performance. You can't just turn an oil well off, or even mess with it too much, because there'll be more oil, more water, more junk. So how does it work with the futures? How do you build products on these? Cause i think that's hard for peple to wrap their minds round the fact that you're not actually buying the commodityes themselves. And you can.