opened a $20M oil?

Probably “oil long” is the opposite of an “oil short”, where you bet the price is going to rise, as opposed to betting it’s going to fall? I don’t know much about this stuff though.

– Frost

Isn’t the opposite of a short just buying stock/commodities? Maybe buying them on credit if you want to get 1920s with it
Yes, but you can also be long in futures or options. They can be more profitable but are higher risk. Assuming that you aren’t in the room for market shifting events anyway, then the bets are much more certain.
futures are a leveraged bet on higher price (buy long) or lower price (sell short) by the 3rd week of a month.